/********************************************************************
 KWin - the KDE window manager
 This file is part of the KDE project.

Copyright (C) 1999, 2000 Matthias Ettrich <ettrich@kde.org>
Copyright (C) 2003 Lubos Lunak <l.lunak@kde.org>
Copyright (C) 2009 Lucas Murray <lmurray@undefinedfire.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/

/*

 This file contains things relevant to geometry, i.e. workspace size,
 window positions and window sizes.

*/

#include "x11client.h"
#include "composite.h"
#include "cursor.h"
#include "netinfo.h"
#include "workspace.h"

#include "placement.h"
#include "geometrytip.h"
#include "rules.h"
#include "screens.h"
#include "effects.h"
#include "screenedge.h"
#include "internal_client.h"
#include <QApplication>
#include <QDebug>
#include <QVarLengthArray>

#include "outline.h"
#include "xdgshellclient.h"
#include "wayland_server.h"

#include <KDecoration2/Decoration>
#include <KDecoration2/DecoratedClient>

namespace KWin
{

static inline int sign(int v) {
    return (v > 0) - (v < 0);
}

//********************************************
// Workspace
//********************************************

extern int screen_number;
extern bool is_multihead;

/**
 * Resizes the workspace after an XRANDR screen size change
 */
void Workspace::desktopResized()
{
    QRect geom = screens()->geometry();
    if (rootInfo()) {
        NETSize desktop_geometry;
        desktop_geometry.width = geom.width();
        desktop_geometry.height = geom.height();
        rootInfo()->setDesktopGeometry(desktop_geometry);
    }

    updateClientArea();
    saveOldScreenSizes(); // after updateClientArea(), so that one still uses the previous one

    // TODO: emit a signal instead and remove the deep function calls into edges and effects
    ScreenEdges::self()->recreateEdges();

    if (effects) {
        static_cast<EffectsHandlerImpl*>(effects)->desktopResized(geom.size());
    }
}

void Workspace::saveOldScreenSizes()
{
    olddisplaysize = screens()->displaySize();
    oldscreensizes.clear();
    for( int i = 0;
         i < screens()->count();
         ++i )
        oldscreensizes.append( screens()->geometry( i ));
}

/**
 * Updates the current client areas according to the current clients.
 *
 * If the area changes or force is @c true, the new areas are propagated to the world.
 *
 * The client area is the area that is available for clients (that
 * which is not taken by windows like panels, the top-of-screen menu
 * etc).
 *
 * @see clientArea()
 */
void Workspace::updateClientArea(bool force)
{
    const Screens *s = Screens::self();
    int nscreens = s->count();
    const int numberOfDesktops = VirtualDesktopManager::self()->count();
    QVector< QRect > new_wareas(numberOfDesktops + 1);
    QVector< StrutRects > new_rmoveareas(numberOfDesktops + 1);
    QVector< QVector< QRect > > new_sareas(numberOfDesktops + 1);
    QVector< QRect > screens(nscreens);
    QRect desktopArea;
    for (int i = 0; i < nscreens; i++) {
        desktopArea |= s->geometry(i);
    }
    for (int iS = 0;
            iS < nscreens;
            iS ++) {
        screens [iS] = s->geometry(iS);
    }
    for (int i = 1;
            i <= numberOfDesktops;
            ++i) {
        new_wareas[ i ] = desktopArea;
        new_sareas[ i ].resize(nscreens);
        for (int iS = 0;
                iS < nscreens;
                iS ++)
            new_sareas[ i ][ iS ] = screens[ iS ];
    }
    for (ClientList::ConstIterator it = clients.constBegin(); it != clients.constEnd(); ++it) {
        if (!(*it)->hasStrut())
            continue;
        QRect r = (*it)->adjustedClientArea(desktopArea, desktopArea);
        // sanity check that a strut doesn't exclude a complete screen geometry
        // this is a violation to EWMH, as KWin just ignores the strut
        for (int i = 0; i < Screens::self()->count(); i++) {
            if (!r.intersects(Screens::self()->geometry(i))) {
                qCDebug(KWIN_CORE) << "Adjusted client area would exclude a complete screen, ignore";
                r = desktopArea;
                break;
            }
        }
        StrutRects strutRegion = (*it)->strutRects();
        const QRect clientsScreenRect = KWin::screens()->geometry((*it)->screen());
        for (auto strut = strutRegion.begin(); strut != strutRegion.end(); strut++) {
            *strut = StrutRect((*strut).intersected(clientsScreenRect), (*strut).area());
        }

        // Ignore offscreen xinerama struts. These interfere with the larger monitors on the setup
        // and should be ignored so that applications that use the work area to work out where
        // windows can go can use the entire visible area of the larger monitors.
        // This goes against the EWMH description of the work area but it is a toss up between
        // having unusable sections of the screen (Which can be quite large with newer monitors)
        // or having some content appear offscreen (Relatively rare compared to other).
        bool hasOffscreenXineramaStrut = (*it)->hasOffscreenXineramaStrut();

        if ((*it)->isOnAllDesktops()) {
            for (int i = 1;
                    i <= numberOfDesktops;
                    ++i) {
                if (!hasOffscreenXineramaStrut)
                    new_wareas[ i ] = new_wareas[ i ].intersected(r);
                new_rmoveareas[ i ] += strutRegion;
                for (int iS = 0;
                        iS < nscreens;
                        iS ++) {
                    const auto geo = new_sareas[ i ][ iS ].intersected(
                                                (*it)->adjustedClientArea(desktopArea, screens[ iS ]));
                    // ignore the geometry if it results in the screen getting removed completely
                    if (!geo.isEmpty()) {
                        new_sareas[ i ][ iS ] = geo;
                    }
                }
            }
        } else {
            if (!hasOffscreenXineramaStrut)
                new_wareas[(*it)->desktop()] = new_wareas[(*it)->desktop()].intersected(r);
            new_rmoveareas[(*it)->desktop()] += strutRegion;
            for (int iS = 0;
                    iS < nscreens;
                    iS ++) {
//                            qDebug() << "adjusting new_sarea: " << screens[ iS ];
                const auto geo = new_sareas[(*it)->desktop()][ iS ].intersected(
                      (*it)->adjustedClientArea(desktopArea, screens[ iS ]));
                // ignore the geometry if it results in the screen getting removed completely
                if (!geo.isEmpty()) {
                    new_sareas[(*it)->desktop()][ iS ] = geo;
                }
            }
        }
    }
    if (waylandServer()) {
        auto updateStrutsForWaylandClient = [&] (XdgShellClient *c) {
            // assuming that only docks have "struts" and that all docks have a strut
            if (!c->hasStrut()) {
                return;
            }
            auto margins = [c] (const QRect &geometry) {
                QMargins margins;
                if (!geometry.intersects(c->frameGeometry())) {
                    return margins;
                }
                // figure out which areas of the overall screen setup it borders
                const bool left = c->frameGeometry().left() == geometry.left();
                const bool right = c->frameGeometry().right() == geometry.right();
                const bool top = c->frameGeometry().top() == geometry.top();
                const bool bottom = c->frameGeometry().bottom() == geometry.bottom();
                const bool horizontal = c->frameGeometry().width() >= c->frameGeometry().height();
                if (left && ((!top && !bottom) || !horizontal)) {
                    margins.setLeft(c->frameGeometry().width());
                }
                if (right && ((!top && !bottom) || !horizontal)) {
                    margins.setRight(c->frameGeometry().width());
                }
                if (top && ((!left && !right) || horizontal)) {
                    margins.setTop(c->frameGeometry().height());
                }
                if (bottom && ((!left && !right) || horizontal)) {
                    margins.setBottom(c->frameGeometry().height());
                }
                return margins;
            };
            auto marginsToStrutArea = [] (const QMargins &margins) {
                if (margins.left() != 0) {
                    return StrutAreaLeft;
                }
                if (margins.right() != 0) {
                    return StrutAreaRight;
                }
                if (margins.top() != 0) {
                    return StrutAreaTop;
                }
                if (margins.bottom() != 0) {
                    return StrutAreaBottom;
                }
                return StrutAreaInvalid;
            };
            const auto strut = margins(KWin::screens()->geometry(c->screen()));
            const StrutRects strutRegion = StrutRects{StrutRect(c->frameGeometry(), marginsToStrutArea(strut))};
            QRect r = desktopArea - margins(KWin::screens()->geometry());
            if (c->isOnAllDesktops()) {
                for (int i = 1; i <= numberOfDesktops; ++i) {
                    new_wareas[ i ] = new_wareas[ i ].intersected(r);
                    for (int iS = 0; iS < nscreens; ++iS) {
                        new_sareas[ i ][ iS ] = new_sareas[ i ][ iS ].intersected(screens[iS] - margins(screens[iS]));
                    }
                    new_rmoveareas[ i ] += strutRegion;
                }
            } else {
                new_wareas[c->desktop()] = new_wareas[c->desktop()].intersected(r);
                for (int iS = 0; iS < nscreens; iS++) {
                    new_sareas[c->desktop()][ iS ] = new_sareas[c->desktop()][ iS ].intersected(screens[iS] - margins(screens[iS]));
                }
                new_rmoveareas[ c->desktop() ] += strutRegion;
            }
        };
        const auto clients = waylandServer()->clients();
        for (auto c : clients) {
            updateStrutsForWaylandClient(c);
        }
    }
#if 0
    for (int i = 1;
            i <= numberOfDesktops();
            ++i) {
        for (int iS = 0;
                iS < nscreens;
                iS ++)
            qCDebug(KWIN_CORE) << "new_sarea: " << new_sareas[ i ][ iS ];
    }
#endif

    bool changed = force;

    if (screenarea.isEmpty())
        changed = true;

    for (int i = 1;
            !changed && i <= numberOfDesktops;
            ++i) {
        if (workarea[ i ] != new_wareas[ i ])
            changed = true;
        if (restrictedmovearea[ i ] != new_rmoveareas[ i ])
            changed = true;
        if (screenarea[ i ].size() != new_sareas[ i ].size())
            changed = true;
        for (int iS = 0;
                !changed && iS < nscreens;
                iS ++)
            if (new_sareas[ i ][ iS ] != screenarea [ i ][ iS ])
                changed = true;
    }

    if (changed) {
        workarea = new_wareas;
        oldrestrictedmovearea = restrictedmovearea;
        restrictedmovearea = new_rmoveareas;
        screenarea = new_sareas;
        if (rootInfo()) {
            NETRect r;
            for (int i = 1; i <= numberOfDesktops; i++) {
                r.pos.x = workarea[ i ].x();
                r.pos.y = workarea[ i ].y();
                r.size.width = workarea[ i ].width();
                r.size.height = workarea[ i ].height();
                rootInfo()->setWorkArea(i, r);
            }
        }

        for (auto it = m_allClients.constBegin();
                it != m_allClients.constEnd();
                ++it)
            (*it)->checkWorkspacePosition();

        oldrestrictedmovearea.clear(); // reset, no longer valid or needed
    }
}

void Workspace::updateClientArea()
{
    updateClientArea(false);
}


/**
 * Returns the area available for clients. This is the desktop
 * geometry minus windows on the dock. Placement algorithms should
 * refer to this rather than Screens::geometry.
 */
QRect Workspace::clientArea(clientAreaOption opt, int screen, int desktop) const
{
    if (desktop == NETWinInfo::OnAllDesktops || desktop == 0)
        desktop = VirtualDesktopManager::self()->current();
    if (screen == -1)
        screen = screens()->current();
    const QSize displaySize = screens()->displaySize();

    QRect sarea, warea;

    if (is_multihead) {
        sarea = (!screenarea.isEmpty()
                   && screen < screenarea[ desktop ].size()) // screens may be missing during KWin initialization or screen config changes
                  ? screenarea[ desktop ][ screen_number ]
                  : screens()->geometry(screen_number);
        warea = workarea[ desktop ].isNull()
                ? screens()->geometry(screen_number)
                : workarea[ desktop ];
    } else {
        sarea = (!screenarea.isEmpty()
                && screen < screenarea[ desktop ].size()) // screens may be missing during KWin initialization or screen config changes
                ? screenarea[ desktop ][ screen ]
                : screens()->geometry(screen);
        warea = workarea[ desktop ].isNull()
                ? QRect(0, 0, displaySize.width(), displaySize.height())
                : workarea[ desktop ];
    }

    switch(opt) {
    case MaximizeArea:
    case PlacementArea:
            return sarea;
    case MaximizeFullArea:
    case FullScreenArea:
    case MovementArea:
    case ScreenArea:
        if (is_multihead)
            return screens()->geometry(screen_number);
        else
            return screens()->geometry(screen);
    case WorkArea:
        if (is_multihead)
            return sarea;
        else
            return warea;
    case FullArea:
        return QRect(0, 0, displaySize.width(), displaySize.height());
    }
    abort();
}


QRect Workspace::clientArea(clientAreaOption opt, const QPoint& p, int desktop) const
{
    return clientArea(opt, screens()->number(p), desktop);
}

QRect Workspace::clientArea(clientAreaOption opt, const AbstractClient* c) const
{
    return clientArea(opt, c->frameGeometry().center(), c->desktop());
}

QRegion Workspace::restrictedMoveArea(int desktop, StrutAreas areas) const
{
    if (desktop == NETWinInfo::OnAllDesktops || desktop == 0)
        desktop = VirtualDesktopManager::self()->current();
    QRegion region;
    foreach (const StrutRect & rect, restrictedmovearea[desktop])
    if (areas & rect.area())
        region += rect;
    return region;
}

bool Workspace::inUpdateClientArea() const
{
    return !oldrestrictedmovearea.isEmpty();
}

QRegion Workspace::previousRestrictedMoveArea(int desktop, StrutAreas areas) const
{
    if (desktop == NETWinInfo::OnAllDesktops || desktop == 0)
        desktop = VirtualDesktopManager::self()->current();
    QRegion region;
    foreach (const StrutRect & rect, oldrestrictedmovearea.at(desktop))
    if (areas & rect.area())
        region += rect;
    return region;
}

QVector< QRect > Workspace::previousScreenSizes() const
{
    return oldscreensizes;
}

int Workspace::oldDisplayWidth() const
{
    return olddisplaysize.width();
}

int Workspace::oldDisplayHeight() const
{
    return olddisplaysize.height();
}

/**
 * Client \a c is moved around to position \a pos. This gives the
 * workspace the opportunity to interveniate and to implement
 * snap-to-windows functionality.
 *
 * The parameter \a snapAdjust is a multiplier used to calculate the
 * effective snap zones. When 1.0, it means that the snap zones will be
 * used without change.
 */
QPoint Workspace::adjustClientPosition(AbstractClient* c, QPoint pos, bool unrestricted, double snapAdjust)
{
    QSize borderSnapZone(options->borderSnapZone(), options->borderSnapZone());
    QRect maxRect;
    int guideMaximized = MaximizeRestore;
    if (c->maximizeMode() != MaximizeRestore) {
        maxRect = clientArea(MaximizeArea, pos + c->rect().center(), c->desktop());
        QRect geo = c->frameGeometry();
        if (c->maximizeMode() & MaximizeHorizontal && (geo.x() == maxRect.left() || geo.right() == maxRect.right())) {
            guideMaximized |= MaximizeHorizontal;
            borderSnapZone.setWidth(qMax(borderSnapZone.width() + 2, maxRect.width() / 16));
        }
        if (c->maximizeMode() & MaximizeVertical && (geo.y() == maxRect.top() || geo.bottom() == maxRect.bottom())) {
            guideMaximized |= MaximizeVertical;
            borderSnapZone.setHeight(qMax(borderSnapZone.height() + 2, maxRect.height() / 16));
        }
    }

    if (options->windowSnapZone() || !borderSnapZone.isNull() || options->centerSnapZone()) {

        const bool sOWO = options->isSnapOnlyWhenOverlapping();
        const int screen = screens()->number(pos + c->rect().center());
        if (maxRect.isNull())
            maxRect = clientArea(MovementArea, screen, c->desktop());
        const int xmin = maxRect.left();
        const int xmax = maxRect.right() + 1;             //desk size
        const int ymin = maxRect.top();
        const int ymax = maxRect.bottom() + 1;

        const int cx(pos.x());
        const int cy(pos.y());
        const int cw(c->width());
        const int ch(c->height());
        const int rx(cx + cw);
        const int ry(cy + ch);               //these don't change

        int nx(cx), ny(cy);                         //buffers
        int deltaX(xmax);
        int deltaY(ymax);   //minimum distance to other clients

        int lx, ly, lrx, lry; //coords and size for the comparison client, l

        // border snap
        const int snapX = borderSnapZone.width() * snapAdjust; //snap trigger
        const int snapY = borderSnapZone.height() * snapAdjust;
        if (snapX || snapY) {
            QRect geo = c->frameGeometry();
            QMargins frameMargins = c->frameMargins();

            // snap to titlebar / snap to window borders on inner screen edges
            AbstractClient::Position titlePos = c->titlebarPosition();
            if (frameMargins.left() && (titlePos == AbstractClient::PositionLeft || (c->maximizeMode() & MaximizeHorizontal) ||
                                        screens()->intersecting(geo.translated(maxRect.x() - (frameMargins.left() + geo.x()), 0)) > 1)) {
                frameMargins.setLeft(0);
            }
            if (frameMargins.right() && (titlePos == AbstractClient::PositionRight || (c->maximizeMode() & MaximizeHorizontal) ||
                                         screens()->intersecting(geo.translated(maxRect.right() + frameMargins.right() - geo.right(), 0)) > 1)) {
                frameMargins.setRight(0);
            }
            if (frameMargins.top() && (titlePos == AbstractClient::PositionTop || (c->maximizeMode() & MaximizeVertical) ||
                                       screens()->intersecting(geo.translated(0, maxRect.y() - (frameMargins.top() + geo.y()))) > 1)) {
                frameMargins.setTop(0);
            }
            if (frameMargins.bottom() && (titlePos == AbstractClient::PositionBottom || (c->maximizeMode() & MaximizeVertical) ||
                                          screens()->intersecting(geo.translated(0, maxRect.bottom() + frameMargins.bottom() - geo.bottom())) > 1)) {
                frameMargins.setBottom(0);
            }
            if ((sOWO ? (cx < xmin) : true) && (qAbs(xmin - cx) < snapX)) {
                deltaX = xmin - cx;
                nx = xmin - frameMargins.left();
            }
            if ((sOWO ? (rx > xmax) : true) && (qAbs(rx - xmax) < snapX) && (qAbs(xmax - rx) < deltaX)) {
                deltaX = rx - xmax;
                nx = xmax - cw + frameMargins.right();
            }

            if ((sOWO ? (cy < ymin) : true) && (qAbs(ymin - cy) < snapY)) {
                deltaY = ymin - cy;
                ny = ymin - frameMargins.top();
            }
            if ((sOWO ? (ry > ymax) : true) && (qAbs(ry - ymax) < snapY) && (qAbs(ymax - ry) < deltaY)) {
                deltaY = ry - ymax;
                ny = ymax - ch + frameMargins.bottom();
            }
        }

        // windows snap
        int snap = options->windowSnapZone() * snapAdjust;
        if (snap) {
            for (auto l = m_allClients.constBegin(); l != m_allClients.constEnd(); ++l) {
                if ((*l) == c)
                    continue;
                if ((*l)->isMinimized())
                    continue; // is minimized
                if (!(*l)->isShown(false))
                    continue;
                if (!((*l)->isOnDesktop(c->desktop()) || c->isOnDesktop((*l)->desktop())))
                    continue; // wrong virtual desktop
                if (!(*l)->isOnCurrentActivity())
                    continue; // wrong activity
                if ((*l)->isDesktop() || (*l)->isSplash())
                    continue;

                lx = (*l)->x();
                ly = (*l)->y();
                lrx = lx + (*l)->width();
                lry = ly + (*l)->height();

                if (!(guideMaximized & MaximizeHorizontal) &&
                    (((cy <= lry) && (cy  >= ly)) || ((ry >= ly) && (ry  <= lry)) || ((cy <= ly) && (ry >= lry)))) {
                    if ((sOWO ? (cx < lrx) : true) && (qAbs(lrx - cx) < snap) && (qAbs(lrx - cx) < deltaX)) {
                        deltaX = qAbs(lrx - cx);
                        nx = lrx;
                    }
                    if ((sOWO ? (rx > lx) : true) && (qAbs(rx - lx) < snap) && (qAbs(rx - lx) < deltaX)) {
                        deltaX = qAbs(rx - lx);
                        nx = lx - cw;
                    }
                }

                if (!(guideMaximized & MaximizeVertical) &&
                    (((cx <= lrx) && (cx  >= lx)) || ((rx >= lx) && (rx  <= lrx)) || ((cx <= lx) && (rx >= lrx)))) {
                    if ((sOWO ? (cy < lry) : true) && (qAbs(lry - cy) < snap) && (qAbs(lry - cy) < deltaY)) {
                        deltaY = qAbs(lry - cy);
                        ny = lry;
                    }
                    //if ( (qAbs( ry-ly ) < snap) && (qAbs( ry - ly ) < deltaY ))
                    if ((sOWO ? (ry > ly) : true) && (qAbs(ry - ly) < snap) && (qAbs(ry - ly) < deltaY)) {
                        deltaY = qAbs(ry - ly);
                        ny = ly - ch;
                    }
                }

                // Corner snapping
                if (!(guideMaximized & MaximizeVertical) && (nx == lrx || nx + cw == lx)) {
                    if ((sOWO ? (ry > lry) : true) && (qAbs(lry - ry) < snap) && (qAbs(lry - ry) < deltaY)) {
                        deltaY = qAbs(lry - ry);
                        ny = lry - ch;
                    }
                    if ((sOWO ? (cy < ly) : true) && (qAbs(cy - ly) < snap) && (qAbs(cy - ly) < deltaY)) {
                        deltaY = qAbs(cy - ly);
                        ny = ly;
                    }
                }
                if (!(guideMaximized & MaximizeHorizontal) && (ny == lry || ny + ch == ly)) {
                    if ((sOWO ? (rx > lrx) : true) && (qAbs(lrx - rx) < snap) && (qAbs(lrx - rx) < deltaX)) {
                        deltaX = qAbs(lrx - rx);
                        nx = lrx - cw;
                    }
                    if ((sOWO ? (cx < lx) : true) && (qAbs(cx - lx) < snap) && (qAbs(cx - lx) < deltaX)) {
                        deltaX = qAbs(cx - lx);
                        nx = lx;
                    }
                }
            }
        }

        // center snap
        snap = options->centerSnapZone() * snapAdjust; //snap trigger
        if (snap) {
            int diffX = qAbs((xmin + xmax) / 2 - (cx + cw / 2));
            int diffY = qAbs((ymin + ymax) / 2 - (cy + ch / 2));
            if (diffX < snap && diffY < snap && diffX < deltaX && diffY < deltaY) {
                // Snap to center of screen
                nx = (xmin + xmax) / 2 - cw / 2;
                ny = (ymin + ymax) / 2 - ch / 2;
            } else if (options->borderSnapZone()) {
                // Enhance border snap
                if ((nx == xmin || nx == xmax - cw) && diffY < snap && diffY < deltaY) {
                    // Snap to vertical center on screen edge
                    ny = (ymin + ymax) / 2 - ch / 2;
                } else if (((unrestricted ? ny == ymin : ny <= ymin) || ny == ymax - ch) &&
                          diffX < snap && diffX < deltaX) {
                    // Snap to horizontal center on screen edge
                    nx = (xmin + xmax) / 2 - cw / 2;
                }
            }
        }

        pos = QPoint(nx, ny);
    }
    return pos;
}

QRect Workspace::adjustClientSize(AbstractClient* c, QRect moveResizeGeom, int mode)
{
    //adapted from adjustClientPosition on 29May2004
    //this function is called when resizing a window and will modify
    //the new dimensions to snap to other windows/borders if appropriate
    if (options->windowSnapZone() || options->borderSnapZone()) {  // || options->centerSnapZone )
        const bool sOWO = options->isSnapOnlyWhenOverlapping();

        const QRect maxRect = clientArea(MovementArea, c->rect().center(), c->desktop());
        const int xmin = maxRect.left();
        const int xmax = maxRect.right();               //desk size
        const int ymin = maxRect.top();
        const int ymax = maxRect.bottom();

        const int cx(moveResizeGeom.left());
        const int cy(moveResizeGeom.top());
        const int rx(moveResizeGeom.right());
        const int ry(moveResizeGeom.bottom());

        int newcx(cx), newcy(cy);                         //buffers
        int newrx(rx), newry(ry);
        int deltaX(xmax);
        int deltaY(ymax);   //minimum distance to other clients

        int lx, ly, lrx, lry; //coords and size for the comparison client, l

        // border snap
        int snap = options->borderSnapZone(); //snap trigger
        if (snap) {
            deltaX = int(snap);
            deltaY = int(snap);

#define SNAP_BORDER_TOP \
    if ((sOWO?(newcy<ymin):true) && (qAbs(ymin-newcy)<deltaY)) \
    { \
        deltaY = qAbs(ymin-newcy); \
        newcy = ymin; \
    }

#define SNAP_BORDER_BOTTOM \
    if ((sOWO?(newry>ymax):true) && (qAbs(ymax-newry)<deltaY)) \
    { \
        deltaY = qAbs(ymax-newcy); \
        newry = ymax; \
    }

#define SNAP_BORDER_LEFT \
    if ((sOWO?(newcx<xmin):true) && (qAbs(xmin-newcx)<deltaX)) \
    { \
        deltaX = qAbs(xmin-newcx); \
        newcx = xmin; \
    }

#define SNAP_BORDER_RIGHT \
    if ((sOWO?(newrx>xmax):true) && (qAbs(xmax-newrx)<deltaX)) \
    { \
        deltaX = qAbs(xmax-newrx); \
        newrx = xmax; \
    }
            switch(mode) {
            case AbstractClient::PositionBottomRight:
                SNAP_BORDER_BOTTOM
                SNAP_BORDER_RIGHT
                break;
            case AbstractClient::PositionRight:
                SNAP_BORDER_RIGHT
                break;
            case AbstractClient::PositionBottom:
                SNAP_BORDER_BOTTOM
                break;
            case AbstractClient::PositionTopLeft:
                SNAP_BORDER_TOP
                SNAP_BORDER_LEFT
                break;
            case AbstractClient::PositionLeft:
                SNAP_BORDER_LEFT
                break;
            case AbstractClient::PositionTop:
                SNAP_BORDER_TOP
                break;
            case AbstractClient::PositionTopRight:
                SNAP_BORDER_TOP
                SNAP_BORDER_RIGHT
                break;
            case AbstractClient::PositionBottomLeft:
                SNAP_BORDER_BOTTOM
                SNAP_BORDER_LEFT
                break;
            default:
                abort();
                break;
            }


        }

        // windows snap
        snap = options->windowSnapZone();
        if (snap) {
            deltaX = int(snap);
            deltaY = int(snap);
            for (auto l = m_allClients.constBegin(); l != m_allClients.constEnd(); ++l) {
                if ((*l)->isOnDesktop(VirtualDesktopManager::self()->current()) &&
                        !(*l)->isMinimized()
                        && (*l) != c) {
                    lx = (*l)->x() - 1;
                    ly = (*l)->y() - 1;
                    lrx = (*l)->x() + (*l)->width();
                    lry = (*l)->y() + (*l)->height();

#define WITHIN_HEIGHT ((( newcy <= lry ) && ( newcy  >= ly  ))  || \
                       (( newry >= ly  ) && ( newry  <= lry ))  || \
                       (( newcy <= ly  ) && ( newry >= lry  )) )

#define WITHIN_WIDTH  ( (( cx <= lrx ) && ( cx  >= lx  ))  || \
                        (( rx >= lx  ) && ( rx  <= lrx ))  || \
                        (( cx <= lx  ) && ( rx >= lrx  )) )

#define SNAP_WINDOW_TOP  if ( (sOWO?(newcy<lry):true) \
                              && WITHIN_WIDTH  \
                              && (qAbs( lry - newcy ) < deltaY) ) {  \
    deltaY = qAbs( lry - newcy ); \
    newcy=lry; \
}

#define SNAP_WINDOW_BOTTOM  if ( (sOWO?(newry>ly):true)  \
                                 && WITHIN_WIDTH  \
                                 && (qAbs( ly - newry ) < deltaY) ) {  \
    deltaY = qAbs( ly - newry );  \
    newry=ly;  \
}

#define SNAP_WINDOW_LEFT  if ( (sOWO?(newcx<lrx):true)  \
                               && WITHIN_HEIGHT  \
                               && (qAbs( lrx - newcx ) < deltaX)) {  \
    deltaX = qAbs( lrx - newcx );  \
    newcx=lrx;  \
}

#define SNAP_WINDOW_RIGHT  if ( (sOWO?(newrx>lx):true)  \
                                && WITHIN_HEIGHT  \
                                && (qAbs( lx - newrx ) < deltaX))  \
{  \
    deltaX = qAbs( lx - newrx );  \
    newrx=lx;  \
}

#define SNAP_WINDOW_C_TOP  if ( (sOWO?(newcy<ly):true)  \
                                && (newcx == lrx || newrx == lx)  \
                                && qAbs(ly-newcy) < deltaY ) {  \
    deltaY = qAbs( ly - newcy + 1 ); \
    newcy = ly + 1; \
}

#define SNAP_WINDOW_C_BOTTOM  if ( (sOWO?(newry>lry):true)  \
                                   && (newcx == lrx || newrx == lx)  \
                                   && qAbs(lry-newry) < deltaY ) {  \
    deltaY = qAbs( lry - newry - 1 ); \
    newry = lry - 1; \
}

#define SNAP_WINDOW_C_LEFT  if ( (sOWO?(newcx<lx):true)  \
                                 && (newcy == lry || newry == ly)  \
                                 && qAbs(lx-newcx) < deltaX ) {  \
    deltaX = qAbs( lx - newcx + 1 ); \
    newcx = lx + 1; \
}

#define SNAP_WINDOW_C_RIGHT  if ( (sOWO?(newrx>lrx):true)  \
                                  && (newcy == lry || newry == ly)  \
                                  && qAbs(lrx-newrx) < deltaX ) {  \
    deltaX = qAbs( lrx - newrx - 1 ); \
    newrx = lrx - 1; \
}

                    switch(mode) {
                    case AbstractClient::PositionBottomRight:
                        SNAP_WINDOW_BOTTOM
                        SNAP_WINDOW_RIGHT
                        SNAP_WINDOW_C_BOTTOM
                        SNAP_WINDOW_C_RIGHT
                        break;
                    case AbstractClient::PositionRight:
                        SNAP_WINDOW_RIGHT
                        SNAP_WINDOW_C_RIGHT
                        break;
                    case AbstractClient::PositionBottom:
                        SNAP_WINDOW_BOTTOM
                        SNAP_WINDOW_C_BOTTOM
                        break;
                    case AbstractClient::PositionTopLeft:
                        SNAP_WINDOW_TOP
                        SNAP_WINDOW_LEFT
                        SNAP_WINDOW_C_TOP
                        SNAP_WINDOW_C_LEFT
                        break;
                    case AbstractClient::PositionLeft:
                        SNAP_WINDOW_LEFT
                        SNAP_WINDOW_C_LEFT
                        break;
                    case AbstractClient::PositionTop:
                        SNAP_WINDOW_TOP
                        SNAP_WINDOW_C_TOP
                        break;
                    case AbstractClient::PositionTopRight:
                        SNAP_WINDOW_TOP
                        SNAP_WINDOW_RIGHT
                        SNAP_WINDOW_C_TOP
                        SNAP_WINDOW_C_RIGHT
                        break;
                    case AbstractClient::PositionBottomLeft:
                        SNAP_WINDOW_BOTTOM
                        SNAP_WINDOW_LEFT
                        SNAP_WINDOW_C_BOTTOM
                        SNAP_WINDOW_C_LEFT
                        break;
                    default:
                        abort();
                        break;
                    }
                }
            }
        }

        // center snap
        //snap = options->centerSnapZone;
        //if (snap)
        //    {
        //    // Don't resize snap to center as it interferes too much
        //    // There are two ways of implementing this if wanted:
        //    // 1) Snap only to the same points that the move snap does, and
        //    // 2) Snap to the horizontal and vertical center lines of the screen
        //    }

        moveResizeGeom = QRect(QPoint(newcx, newcy), QPoint(newrx, newry));
    }
    return moveResizeGeom;
}

/**
 * Marks the client as being moved or resized by the user.
 */
void Workspace::setMoveResizeClient(AbstractClient *c)
{
    Q_ASSERT(!c || !movingClient); // Catch attempts to move a second
    // window while still moving the first one.
    movingClient = c;
    if (movingClient)
        ++block_focus;
    else
        --block_focus;
}

// When kwin crashes, windows will not be gravitated back to their original position
// and will remain offset by the size of the decoration. So when restarting, fix this
// (the property with the size of the frame remains on the window after the crash).
void Workspace::fixPositionAfterCrash(xcb_window_t w, const xcb_get_geometry_reply_t *geometry)
{
    NETWinInfo i(connection(), w, rootWindow(), NET::WMFrameExtents, NET::Properties2());
    NETStrut frame = i.frameExtents();

    if (frame.left != 0 || frame.top != 0) {
        // left and top needed due to narrowing conversations restrictions in C++11
        const uint32_t left = frame.left;
        const uint32_t top = frame.top;
        const uint32_t values[] = { geometry->x - left, geometry->y - top };
        xcb_configure_window(connection(), w, XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y, values);
    }
}

//********************************************
// Client
//********************************************

/**
 * Returns \a area with the client's strut taken into account.
 *
 * Used from Workspace in updateClientArea.
 */
// TODO move to Workspace?

QRect X11Client::adjustedClientArea(const QRect &desktopArea, const QRect& area) const
{
    QRect r = area;
    NETExtendedStrut str = strut();
    QRect stareaL = QRect(
                        0,
                        str . left_start,
                        str . left_width,
                        str . left_end - str . left_start + 1);
    QRect stareaR = QRect(
                        desktopArea . right() - str . right_width + 1,
                        str . right_start,
                        str . right_width,
                        str . right_end - str . right_start + 1);
    QRect stareaT = QRect(
                        str . top_start,
                        0,
                        str . top_end - str . top_start + 1,
                        str . top_width);
    QRect stareaB = QRect(
                        str . bottom_start,
                        desktopArea . bottom() - str . bottom_width + 1,
                        str . bottom_end - str . bottom_start + 1,
                        str . bottom_width);

    QRect screenarea = workspace()->clientArea(ScreenArea, this);
    // HACK: workarea handling is not xinerama aware, so if this strut
    // reserves place at a xinerama edge that's inside the virtual screen,
    // ignore the strut for workspace setting.
    if (area == QRect(QPoint(0, 0), screens()->displaySize())) {
        if (stareaL.left() < screenarea.left())
            stareaL = QRect();
        if (stareaR.right() > screenarea.right())
            stareaR = QRect();
        if (stareaT.top() < screenarea.top())
            stareaT = QRect();
        if (stareaB.bottom() < screenarea.bottom())
            stareaB = QRect();
    }
    // Handle struts at xinerama edges that are inside the virtual screen.
    // They're given in virtual screen coordinates, make them affect only
    // their xinerama screen.
    stareaL.setLeft(qMax(stareaL.left(), screenarea.left()));
    stareaR.setRight(qMin(stareaR.right(), screenarea.right()));
    stareaT.setTop(qMax(stareaT.top(), screenarea.top()));
    stareaB.setBottom(qMin(stareaB.bottom(), screenarea.bottom()));

    if (stareaL . intersects(area)) {
//        qDebug() << "Moving left of: " << r << " to " << stareaL.right() + 1;
        r . setLeft(stareaL . right() + 1);
    }
    if (stareaR . intersects(area)) {
//        qDebug() << "Moving right of: " << r << " to " << stareaR.left() - 1;
        r . setRight(stareaR . left() - 1);
    }
    if (stareaT . intersects(area)) {
//        qDebug() << "Moving top of: " << r << " to " << stareaT.bottom() + 1;
        r . setTop(stareaT . bottom() + 1);
    }
    if (stareaB . intersects(area)) {
//        qDebug() << "Moving bottom of: " << r << " to " << stareaB.top() - 1;
        r . setBottom(stareaB . top() - 1);
    }

    return r;
}

NETExtendedStrut X11Client::strut() const
{
    NETExtendedStrut ext = info->extendedStrut();
    NETStrut str = info->strut();
    const QSize displaySize = screens()->displaySize();
    if (ext.left_width == 0 && ext.right_width == 0 && ext.top_width == 0 && ext.bottom_width == 0
            && (str.left != 0 || str.right != 0 || str.top != 0 || str.bottom != 0)) {
        // build extended from simple
        if (str.left != 0) {
            ext.left_width = str.left;
            ext.left_start = 0;
            ext.left_end = displaySize.height();
        }
        if (str.right != 0) {
            ext.right_width = str.right;
            ext.right_start = 0;
            ext.right_end = displaySize.height();
        }
        if (str.top != 0) {
            ext.top_width = str.top;
            ext.top_start = 0;
            ext.top_end = displaySize.width();
        }
        if (str.bottom != 0) {
            ext.bottom_width = str.bottom;
            ext.bottom_start = 0;
            ext.bottom_end = displaySize.width();
        }
    }
    return ext;
}

StrutRect X11Client::strutRect(StrutArea area) const
{
    Q_ASSERT(area != StrutAreaAll);   // Not valid
    const QSize displaySize = screens()->displaySize();
    NETExtendedStrut strutArea = strut();
    switch(area) {
    case StrutAreaTop:
        if (strutArea.top_width != 0)
            return StrutRect(QRect(
                                 strutArea.top_start, 0,
                                 strutArea.top_end - strutArea.top_start, strutArea.top_width
                             ), StrutAreaTop);
        break;
    case StrutAreaRight:
        if (strutArea.right_width != 0)
            return StrutRect(QRect(
                                 displaySize.width() - strutArea.right_width, strutArea.right_start,
                                 strutArea.right_width, strutArea.right_end - strutArea.right_start
                             ), StrutAreaRight);
        break;
    case StrutAreaBottom:
        if (strutArea.bottom_width != 0)
            return StrutRect(QRect(
                                 strutArea.bottom_start, displaySize.height() - strutArea.bottom_width,
                                 strutArea.bottom_end - strutArea.bottom_start, strutArea.bottom_width
                             ), StrutAreaBottom);
        break;
    case StrutAreaLeft:
        if (strutArea.left_width != 0)
            return StrutRect(QRect(
                                 0, strutArea.left_start,
                                 strutArea.left_width, strutArea.left_end - strutArea.left_start
                             ), StrutAreaLeft);
        break;
    default:
        abort(); // Not valid
    }
    return StrutRect(); // Null rect
}

StrutRects X11Client::strutRects() const
{
    StrutRects region;
    region += strutRect(StrutAreaTop);
    region += strutRect(StrutAreaRight);
    region += strutRect(StrutAreaBottom);
    region += strutRect(StrutAreaLeft);
    return region;
}

bool X11Client::hasStrut() const
{
    NETExtendedStrut ext = strut();
    if (ext.left_width == 0 && ext.right_width == 0 && ext.top_width == 0 && ext.bottom_width == 0)
        return false;
    return true;
}

bool X11Client::hasOffscreenXineramaStrut() const
{
    // Get strut as a QRegion
    QRegion region;
    region += strutRect(StrutAreaTop);
    region += strutRect(StrutAreaRight);
    region += strutRect(StrutAreaBottom);
    region += strutRect(StrutAreaLeft);

    // Remove all visible areas so that only the invisible remain
    for (int i = 0; i < screens()->count(); i ++)
        region -= screens()->geometry(i);

    // If there's anything left then we have an offscreen strut
    return !region.isEmpty();
}

void AbstractClient::checkWorkspacePosition(QRect oldGeometry, int oldDesktop, QRect oldClientGeometry)
{
    enum { Left = 0, Top, Right, Bottom };
    const int border[4] = { borderLeft(), borderTop(), borderRight(), borderBottom() };
    if( !oldGeometry.isValid())
        oldGeometry = frameGeometry();
    if( oldDesktop == -2 )
        oldDesktop = desktop();
    if (!oldClientGeometry.isValid())
        oldClientGeometry = oldGeometry.adjusted(border[Left], border[Top], -border[Right], -border[Bottom]);
    if (isDesktop())
        return;
    if (isFullScreen()) {
        QRect area = workspace()->clientArea(FullScreenArea, this);
        if (frameGeometry() != area)
            setFrameGeometry(area);
        return;
    }
    if (isDock())
        return;

    if (maximizeMode() != MaximizeRestore) {
        // TODO update geom_restore?
        changeMaximize(false, false, true);   // adjust size
        const QRect screenArea = workspace()->clientArea(ScreenArea, this);
        QRect geom = frameGeometry();
        checkOffscreenPosition(&geom, screenArea);
        setFrameGeometry(geom);
        return;
    }

    if (quickTileMode() != QuickTileMode(QuickTileFlag::None)) {
        setFrameGeometry(electricBorderMaximizeGeometry(frameGeometry().center(), desktop()));
        return;
    }

    // this can be true only if this window was mapped before KWin
    // was started - in such case, don't adjust position to workarea,
    // because the window already had its position, and if a window
    // with a strut altering the workarea would be managed in initialization
    // after this one, this window would be moved
    if (!workspace() || workspace()->initializing())
        return;

    // If the window was touching an edge before but not now move it so it is again.
    // Old and new maximums have different starting values so windows on the screen
    // edge will move when a new strut is placed on the edge.
    QRect oldScreenArea;
    if( workspace()->inUpdateClientArea()) {
        // we need to find the screen area as it was before the change
        oldScreenArea = QRect( 0, 0, workspace()->oldDisplayWidth(), workspace()->oldDisplayHeight());
        int distance = INT_MAX;
        foreach(const QRect &r, workspace()->previousScreenSizes()) {
            int d = r.contains( oldGeometry.center()) ? 0 : ( r.center() - oldGeometry.center()).manhattanLength();
            if( d < distance ) {
                distance = d;
                oldScreenArea = r;
            }
        }
    } else {
        oldScreenArea = workspace()->clientArea(ScreenArea, oldGeometry.center(), oldDesktop);
    }
    const QRect oldGeomTall = QRect(oldGeometry.x(), oldScreenArea.y(), oldGeometry.width(), oldScreenArea.height());   // Full screen height
    const QRect oldGeomWide = QRect(oldScreenArea.x(), oldGeometry.y(), oldScreenArea.width(), oldGeometry.height());   // Full screen width
    int oldTopMax = oldScreenArea.y();
    int oldRightMax = oldScreenArea.x() + oldScreenArea.width();
    int oldBottomMax = oldScreenArea.y() + oldScreenArea.height();
    int oldLeftMax = oldScreenArea.x();
    const QRect screenArea = workspace()->clientArea(ScreenArea, geometryRestore().center(), desktop());
    int topMax = screenArea.y();
    int rightMax = screenArea.x() + screenArea.width();
    int bottomMax = screenArea.y() + screenArea.height();
    int leftMax = screenArea.x();
    QRect newGeom = geometryRestore(); // geometry();
    QRect newClientGeom = newGeom.adjusted(border[Left], border[Top], -border[Right], -border[Bottom]);
    const QRect newGeomTall = QRect(newGeom.x(), screenArea.y(), newGeom.width(), screenArea.height());   // Full screen height
    const QRect newGeomWide = QRect(screenArea.x(), newGeom.y(), screenArea.width(), newGeom.height());   // Full screen width
    // Get the max strut point for each side where the window is (E.g. Highest point for
    // the bottom struts bounded by the window's left and right sides).

    // These 4 compute old bounds ...
    auto moveAreaFunc = workspace()->inUpdateClientArea() ?
                                &Workspace::previousRestrictedMoveArea : //... the restricted areas changed
                                &Workspace::restrictedMoveArea; //... when e.g. active desktop or screen changes

    for (const QRect &r : (workspace()->*moveAreaFunc)(oldDesktop, StrutAreaTop)) {
        QRect rect = r & oldGeomTall;
        if (!rect.isEmpty())
            oldTopMax = qMax(oldTopMax, rect.y() + rect.height());
    }
    for (const QRect &r : (workspace()->*moveAreaFunc)(oldDesktop, StrutAreaRight)) {
        QRect rect = r & oldGeomWide;
        if (!rect.isEmpty())
            oldRightMax = qMin(oldRightMax, rect.x());
    }
    for (const QRect &r : (workspace()->*moveAreaFunc)(oldDesktop, StrutAreaBottom)) {
        QRect rect = r & oldGeomTall;
        if (!rect.isEmpty())
            oldBottomMax = qMin(oldBottomMax, rect.y());
    }
    for (const QRect &r : (workspace()->*moveAreaFunc)(oldDesktop, StrutAreaLeft)) {
        QRect rect = r & oldGeomWide;
        if (!rect.isEmpty())
            oldLeftMax = qMax(oldLeftMax, rect.x() + rect.width());
    }

    // These 4 compute new bounds
    for (const QRect &r : workspace()->restrictedMoveArea(desktop(), StrutAreaTop)) {
        QRect rect = r & newGeomTall;
        if (!rect.isEmpty())
            topMax = qMax(topMax, rect.y() + rect.height());
    }
    for (const QRect &r : workspace()->restrictedMoveArea(desktop(), StrutAreaRight)) {
        QRect rect = r & newGeomWide;
        if (!rect.isEmpty())
            rightMax = qMin(rightMax, rect.x());
    }
    for (const QRect &r : workspace()->restrictedMoveArea(desktop(), StrutAreaBottom)) {
        QRect rect = r & newGeomTall;
        if (!rect.isEmpty())
            bottomMax = qMin(bottomMax, rect.y());
    }
    for (const QRect &r : workspace()->restrictedMoveArea(desktop(), StrutAreaLeft)) {
        QRect rect = r & newGeomWide;
        if (!rect.isEmpty())
            leftMax = qMax(leftMax, rect.x() + rect.width());
    }


    // Check if the sides were inside or touching but are no longer
    bool keep[4] = {false, false, false, false};
    bool save[4] = {false, false, false, false};
    int padding[4] = {0, 0, 0, 0};
    if (oldGeometry.x() >= oldLeftMax)
        save[Left] = newGeom.x() < leftMax;
    if (oldGeometry.x() == oldLeftMax)
        keep[Left] = newGeom.x() != leftMax;
    else if (oldClientGeometry.x() == oldLeftMax && newClientGeom.x() != leftMax) {
        padding[0] = border[Left];
        keep[Left] = true;
    }
    if (oldGeometry.y() >= oldTopMax)
        save[Top] = newGeom.y() < topMax;
    if (oldGeometry.y() == oldTopMax)
        keep[Top] = newGeom.y() != topMax;
    else if (oldClientGeometry.y() == oldTopMax && newClientGeom.y() != topMax) {
        padding[1] = border[Left];
        keep[Top] = true;
    }
    if (oldGeometry.right() <= oldRightMax - 1)
        save[Right] = newGeom.right() > rightMax - 1;
    if (oldGeometry.right() == oldRightMax - 1)
        keep[Right] = newGeom.right() != rightMax - 1;
    else if (oldClientGeometry.right() == oldRightMax - 1 && newClientGeom.right() != rightMax - 1) {
        padding[2] = border[Right];
        keep[Right] = true;
    }
    if (oldGeometry.bottom() <= oldBottomMax - 1)
        save[Bottom] = newGeom.bottom() > bottomMax - 1;
    if (oldGeometry.bottom() == oldBottomMax - 1)
        keep[Bottom] = newGeom.bottom() != bottomMax - 1;
    else if (oldClientGeometry.bottom() == oldBottomMax - 1 && newClientGeom.bottom() != bottomMax - 1) {
        padding[3] = border[Bottom];
        keep[Bottom] = true;
    }

    // if randomly touches opposing edges, do not favor either
    if (keep[Left] && keep[Right]) {
        keep[Left] = keep[Right] = false;
        padding[0] = padding[2] = 0;
    }
    if (keep[Top] && keep[Bottom]) {
        keep[Top] = keep[Bottom] = false;
        padding[1] = padding[3] = 0;
    }

    if (save[Left] || keep[Left])
        newGeom.moveLeft(qMax(leftMax, screenArea.x()) - padding[0]);
    if (padding[0] && screens()->intersecting(newGeom) > 1)
        newGeom.moveLeft(newGeom.left() + padding[0]);
    if (save[Top] || keep[Top])
        newGeom.moveTop(qMax(topMax, screenArea.y()) - padding[1]);
    if (padding[1] && screens()->intersecting(newGeom) > 1)
        newGeom.moveTop(newGeom.top() + padding[1]);
    if (save[Right] || keep[Right])
        newGeom.moveRight(qMin(rightMax - 1, screenArea.right()) + padding[2]);
    if (padding[2] && screens()->intersecting(newGeom) > 1)
        newGeom.moveRight(newGeom.right() - padding[2]);
    if (oldGeometry.x() >= oldLeftMax && newGeom.x() < leftMax)
        newGeom.setLeft(qMax(leftMax, screenArea.x()));
    else if (oldClientGeometry.x() >= oldLeftMax && newGeom.x() + border[Left] < leftMax) {
        newGeom.setLeft(qMax(leftMax, screenArea.x()) - border[Left]);
        if (screens()->intersecting(newGeom) > 1)
            newGeom.setLeft(newGeom.left() + border[Left]);
    }
    if (save[Bottom] || keep[Bottom])
        newGeom.moveBottom(qMin(bottomMax - 1, screenArea.bottom()) + padding[3]);
    if (padding[3] && screens()->intersecting(newGeom) > 1)
        newGeom.moveBottom(newGeom.bottom() - padding[3]);
    if (oldGeometry.y() >= oldTopMax && newGeom.y() < topMax)
        newGeom.setTop(qMax(topMax, screenArea.y()));
    else if (oldClientGeometry.y() >= oldTopMax && newGeom.y() + border[Top] < topMax) {
        newGeom.setTop(qMax(topMax, screenArea.y()) - border[Top]);
        if (screens()->intersecting(newGeom) > 1)
            newGeom.setTop(newGeom.top() + border[Top]);
    }

    checkOffscreenPosition(&newGeom, screenArea);
    // Obey size hints. TODO: We really should make sure it stays in the right place
    if (!isShade())
        newGeom.setSize(adjustedSize(newGeom.size()));

    if (newGeom != frameGeometry())
        setFrameGeometry(newGeom);
}

void AbstractClient::checkOffscreenPosition(QRect* geom, const QRect& screenArea)
{
    if (geom->left() > screenArea.right()) {
        geom->moveLeft(screenArea.right() - screenArea.width()/4);
    } else if (geom->right() < screenArea.left()) {
        geom->moveRight(screenArea.left() + screenArea.width()/4);
    }
    if (geom->top() > screenArea.bottom()) {
        geom->moveTop(screenArea.bottom() - screenArea.height()/4);
    } else if (geom->bottom() < screenArea.top()) {
        geom->moveBottom(screenArea.top() + screenArea.width()/4);
    }
}

QSize AbstractClient::adjustedSize(const QSize& frame, Sizemode mode) const
{
    // first, get the window size for the given frame size s
    QSize wsize(frame.width() - (borderLeft() + borderRight()),
                frame.height() - (borderTop() + borderBottom()));
    if (wsize.isEmpty())
        wsize = QSize(qMax(wsize.width(), 1), qMax(wsize.height(), 1));

    return sizeForClientSize(wsize, mode, false);
}

// this helper returns proper size even if the window is shaded
// see also the comment in X11Client::setGeometry()
QSize AbstractClient::adjustedSize() const
{
    return sizeForClientSize(clientSize());
}

/**
 * Calculate the appropriate frame size for the given client size \a
 * wsize.
 *
 * \a wsize is adapted according to the window's size hints (minimum,
 * maximum and incremental size changes).
 */
QSize X11Client::sizeForClientSize(const QSize& wsize, Sizemode mode, bool noframe) const
{
    int w = wsize.width();
    int h = wsize.height();
    if (w < 1 || h < 1) {
        qCWarning(KWIN_CORE) << "sizeForClientSize() with empty size!" ;
    }
    if (w < 1) w = 1;
    if (h < 1) h = 1;

    // basesize, minsize, maxsize, paspect and resizeinc have all values defined,
    // even if they're not set in flags - see getWmNormalHints()
    QSize min_size = minSize();
    QSize max_size = maxSize();
    if (isDecorated()) {
        QSize decominsize(0, 0);
        QSize border_size(borderLeft() + borderRight(), borderTop() + borderBottom());
        if (border_size.width() > decominsize.width())  // just in case
            decominsize.setWidth(border_size.width());
        if (border_size.height() > decominsize.height())
            decominsize.setHeight(border_size.height());
        if (decominsize.width() > min_size.width())
            min_size.setWidth(decominsize.width());
        if (decominsize.height() > min_size.height())
            min_size.setHeight(decominsize.height());
    }
    w = qMin(max_size.width(), w);
    h = qMin(max_size.height(), h);
    w = qMax(min_size.width(), w);
    h = qMax(min_size.height(), h);

    int w1 = w;
    int h1 = h;
    int width_inc = m_geometryHints.resizeIncrements().width();
    int height_inc = m_geometryHints.resizeIncrements().height();
    int basew_inc = m_geometryHints.baseSize().width();
    int baseh_inc = m_geometryHints.baseSize().height();
    if (!m_geometryHints.hasBaseSize()) {
        basew_inc = m_geometryHints.minSize().width();
        baseh_inc = m_geometryHints.minSize().height();
    }
    w = int((w - basew_inc) / width_inc) * width_inc + basew_inc;
    h = int((h - baseh_inc) / height_inc) * height_inc + baseh_inc;
// code for aspect ratios based on code from FVWM
    /*
     * The math looks like this:
     *
     * minAspectX    dwidth     maxAspectX
     * ---------- <= ------- <= ----------
     * minAspectY    dheight    maxAspectY
     *
     * If that is multiplied out, then the width and height are
     * invalid in the following situations:
     *
     * minAspectX * dheight > minAspectY * dwidth
     * maxAspectX * dheight < maxAspectY * dwidth
     *
     */
    if (m_geometryHints.hasAspect()) {
        double min_aspect_w = m_geometryHints.minAspect().width(); // use doubles, because the values can be MAX_INT
        double min_aspect_h = m_geometryHints.minAspect().height(); // and multiplying would go wrong otherwise
        double max_aspect_w = m_geometryHints.maxAspect().width();
        double max_aspect_h = m_geometryHints.maxAspect().height();
        // According to ICCCM 4.1.2.3 PMinSize should be a fallback for PBaseSize for size increments,
        // but not for aspect ratio. Since this code comes from FVWM, handles both at the same time,
        // and I have no idea how it works, let's hope nobody relies on that.
        const QSize baseSize = m_geometryHints.baseSize();
        w -= baseSize.width();
        h -= baseSize.height();
        int max_width = max_size.width() - baseSize.width();
        int min_width = min_size.width() - baseSize.width();
        int max_height = max_size.height() - baseSize.height();
        int min_height = min_size.height() - baseSize.height();
#define ASPECT_CHECK_GROW_W \
    if ( min_aspect_w * h > min_aspect_h * w ) \
    { \
        int delta = int( min_aspect_w * h / min_aspect_h - w ) / width_inc * width_inc; \
        if ( w + delta <= max_width ) \
            w += delta; \
    }
#define ASPECT_CHECK_SHRINK_H_GROW_W \
    if ( min_aspect_w * h > min_aspect_h * w ) \
    { \
        int delta = int( h - w * min_aspect_h / min_aspect_w ) / height_inc * height_inc; \
        if ( h - delta >= min_height ) \
            h -= delta; \
        else \
        { \
            int delta = int( min_aspect_w * h / min_aspect_h - w ) / width_inc * width_inc; \
            if ( w + delta <= max_width ) \
                w += delta; \
        } \
    }
#define ASPECT_CHECK_GROW_H \
    if ( max_aspect_w * h < max_aspect_h * w ) \
    { \
        int delta = int( w * max_aspect_h / max_aspect_w - h ) / height_inc * height_inc; \
        if ( h + delta <= max_height ) \
            h += delta; \
    }
#define ASPECT_CHECK_SHRINK_W_GROW_H \
    if ( max_aspect_w * h < max_aspect_h * w ) \
    { \
        int delta = int( w - max_aspect_w * h / max_aspect_h ) / width_inc * width_inc; \
        if ( w - delta >= min_width ) \
            w -= delta; \
        else \
        { \
            int delta = int( w * max_aspect_h / max_aspect_w - h ) / height_inc * height_inc; \
            if ( h + delta <= max_height ) \
                h += delta; \
        } \
    }
        switch(mode) {
        case SizemodeAny:
#if 0 // make SizemodeAny equal to SizemodeFixedW - prefer keeping fixed width,
            // so that changing aspect ratio to a different value and back keeps the same size (#87298)
            {
                ASPECT_CHECK_SHRINK_H_GROW_W
                ASPECT_CHECK_SHRINK_W_GROW_H
                ASPECT_CHECK_GROW_H
                ASPECT_CHECK_GROW_W
                break;
            }
#endif
        case SizemodeFixedW: {
            // the checks are order so that attempts to modify height are first
            ASPECT_CHECK_GROW_H
            ASPECT_CHECK_SHRINK_H_GROW_W
            ASPECT_CHECK_SHRINK_W_GROW_H
            ASPECT_CHECK_GROW_W
            break;
        }
        case SizemodeFixedH: {
            ASPECT_CHECK_GROW_W
            ASPECT_CHECK_SHRINK_W_GROW_H
            ASPECT_CHECK_SHRINK_H_GROW_W
            ASPECT_CHECK_GROW_H
            break;
        }
        case SizemodeMax: {
            // first checks that try to shrink
            ASPECT_CHECK_SHRINK_H_GROW_W
            ASPECT_CHECK_SHRINK_W_GROW_H
            ASPECT_CHECK_GROW_W
            ASPECT_CHECK_GROW_H
            break;
        }
        }
#undef ASPECT_CHECK_SHRINK_H_GROW_W
#undef ASPECT_CHECK_SHRINK_W_GROW_H
#undef ASPECT_CHECK_GROW_W
#undef ASPECT_CHECK_GROW_H
        w += baseSize.width();
        h += baseSize.height();
    }
    if (!rules()->checkStrictGeometry(!isFullScreen())) {
        // disobey increments and aspect by explicit rule
        w = w1;
        h = h1;
    }

    if (!noframe) {
        w += borderLeft() + borderRight();
        h += borderTop() + borderBottom();
    }
    return rules()->checkSize(QSize(w, h));
}

/**
 * Gets the client's normal WM hints and reconfigures itself respectively.
 */
void X11Client::getWmNormalHints()
{
    const bool hadFixedAspect = m_geometryHints.hasAspect();
    // roundtrip to X server
    m_geometryHints.fetch();
    m_geometryHints.read();

    if (!hadFixedAspect && m_geometryHints.hasAspect()) {
        // align to eventual new contraints
        maximize(max_mode);
    }
    if (isManaged()) {
        // update to match restrictions
        QSize new_size = adjustedSize();
        if (new_size != size() && !isFullScreen()) {
            QRect origClientGeometry(pos() + clientPos(), clientSize());
            resizeWithChecks(new_size);
            if ((!isSpecialWindow() || isToolbar()) && !isFullScreen()) {
                // try to keep the window in its xinerama screen if possible,
                // if that fails at least keep it visible somewhere
                QRect area = workspace()->clientArea(MovementArea, this);
                if (area.contains(origClientGeometry))
                    keepInArea(area);
                area = workspace()->clientArea(WorkArea, this);
                if (area.contains(origClientGeometry))
                    keepInArea(area);
            }
        }
    }
    updateAllowedActions(); // affects isResizeable()
}

QSize X11Client::minSize() const
{
    return rules()->checkMinSize(m_geometryHints.minSize());
}

QSize X11Client::maxSize() const
{
    return rules()->checkMaxSize(m_geometryHints.maxSize());
}

QSize X11Client::basicUnit() const
{
    return m_geometryHints.resizeIncrements();
}

/**
 * Auxiliary function to inform the client about the current window
 * configuration.
 */
void X11Client::sendSyntheticConfigureNotify()
{
    xcb_configure_notify_event_t c;
    memset(&c, 0, sizeof(c));
    c.response_type = XCB_CONFIGURE_NOTIFY;
    c.event = window();
    c.window = window();
    c.x = x() + clientPos().x();
    c.y = y() + clientPos().y();
    c.width = clientSize().width();
    c.height = clientSize().height();
    c.border_width = 0;
    c.above_sibling = XCB_WINDOW_NONE;
    c.override_redirect = 0;
    xcb_send_event(connection(), true, c.event, XCB_EVENT_MASK_STRUCTURE_NOTIFY, reinterpret_cast<const char*>(&c));
    xcb_flush(connection());
}

const QPoint X11Client::calculateGravitation(bool invert, int gravity) const
{
    int dx, dy;
    dx = dy = 0;

    if (gravity == 0)   // default (nonsense) value for the argument
        gravity = m_geometryHints.windowGravity();

// dx, dy specify how the client window moves to make space for the frame
    switch(gravity) {
    case XCB_GRAVITY_NORTH_WEST: // move down right
    default:
        dx = borderLeft();
        dy = borderTop();
        break;
    case XCB_GRAVITY_NORTH: // move right
        dx = 0;
        dy = borderTop();
        break;
    case XCB_GRAVITY_NORTH_EAST: // move down left
        dx = -borderRight();
        dy = borderTop();
        break;
    case XCB_GRAVITY_WEST: // move right
        dx = borderLeft();
        dy = 0;
        break;
    case XCB_GRAVITY_CENTER:
        break; // will be handled specially
    case XCB_GRAVITY_STATIC: // don't move
        dx = 0;
        dy = 0;
        break;
    case XCB_GRAVITY_EAST: // move left
        dx = -borderRight();
        dy = 0;
        break;
    case XCB_GRAVITY_SOUTH_WEST: // move up right
        dx = borderLeft() ;
        dy = -borderBottom();
        break;
    case XCB_GRAVITY_SOUTH: // move up
        dx = 0;
        dy = -borderBottom();
        break;
    case XCB_GRAVITY_SOUTH_EAST: // move up left
        dx = -borderRight();
        dy = -borderBottom();
        break;
    }
    if (gravity != XCB_GRAVITY_CENTER) {
        // translate from client movement to frame movement
        dx -= borderLeft();
        dy -= borderTop();
    } else {
        // center of the frame will be at the same position client center without frame would be
        dx = - (borderLeft() + borderRight()) / 2;
        dy = - (borderTop() + borderBottom()) / 2;
    }
    if (!invert)
        return QPoint(x() + dx, y() + dy);
    else
        return QPoint(x() - dx, y() - dy);
}

void X11Client::configureRequest(int value_mask, int rx, int ry, int rw, int rh, int gravity, bool from_tool)
{
    const int configurePositionMask = XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_Y;
    const int configureSizeMask = XCB_CONFIG_WINDOW_WIDTH | XCB_CONFIG_WINDOW_HEIGHT;
    const int configureGeometryMask = configurePositionMask | configureSizeMask;

    // "maximized" is a user setting -> we do not allow the client to resize itself
    // away from this & against the users explicit wish
    qCDebug(KWIN_CORE) << this << bool(value_mask & configureGeometryMask) <<
                            bool(maximizeMode() & MaximizeVertical) <<
                            bool(maximizeMode() & MaximizeHorizontal);

    // we want to (partially) ignore the request when the window is somehow maximized or quicktiled
    bool ignore = !app_noborder && (quickTileMode() != QuickTileMode(QuickTileFlag::None) || maximizeMode() != MaximizeRestore);
    // however, the user shall be able to force obedience despite and also disobedience in general
    ignore = rules()->checkIgnoreGeometry(ignore);
    if (!ignore) { // either we're not max'd / q'tiled or the user allowed the client to break that - so break it.
        updateQuickTileMode(QuickTileFlag::None);
        max_mode = MaximizeRestore;
        emit quickTileModeChanged();
    } else if (!app_noborder && quickTileMode() == QuickTileMode(QuickTileFlag::None) &&
        (maximizeMode() == MaximizeVertical || maximizeMode() == MaximizeHorizontal)) {
        // ignoring can be, because either we do, or the user does explicitly not want it.
        // for partially maximized windows we want to allow configures in the other dimension.
        // so we've to ask the user again - to know whether we just ignored for the partial maximization.
        // the problem here is, that the user can explicitly permit configure requests - even for maximized windows!
        // we cannot distinguish that from passing "false" for partially maximized windows.
        ignore = rules()->checkIgnoreGeometry(false);
        if (!ignore) { // the user is not interested, so we fix up dimensions
            if (maximizeMode() == MaximizeVertical)
                value_mask &= ~(XCB_CONFIG_WINDOW_Y | XCB_CONFIG_WINDOW_HEIGHT);
            if (maximizeMode() == MaximizeHorizontal)
                value_mask &= ~(XCB_CONFIG_WINDOW_X | XCB_CONFIG_WINDOW_WIDTH);
            if (!(value_mask & configureGeometryMask)) {
                ignore = true; // the modification turned the request void
            }
        }
    }

    if (ignore) {
        qCDebug(KWIN_CORE) << "DENIED";
        return; // nothing to (left) to do for use - bugs #158974, #252314, #321491
    }

    qCDebug(KWIN_CORE) << "PERMITTED" << this << bool(value_mask & configureGeometryMask);

    if (gravity == 0)   // default (nonsense) value for the argument
        gravity = m_geometryHints.windowGravity();
    if (value_mask & configurePositionMask) {
        QPoint new_pos = calculateGravitation(true, gravity);   // undo gravitation
        if (value_mask & XCB_CONFIG_WINDOW_X) {
            new_pos.setX(rx);
        }
        if (value_mask & XCB_CONFIG_WINDOW_Y) {
            new_pos.setY(ry);
        }

        // clever(?) workaround for applications like xv that want to set
        // the location to the current location but miscalculate the
        // frame size due to kwin being a double-reparenting window
        // manager
        if (new_pos.x() == x() + clientPos().x() && new_pos.y() == y() + clientPos().y()
                && gravity == XCB_GRAVITY_NORTH_WEST && !from_tool) {
            new_pos.setX(x());
            new_pos.setY(y());
        }

        int nw = clientSize().width();
        int nh = clientSize().height();
        if (value_mask & XCB_CONFIG_WINDOW_WIDTH) {
            nw = rw;
        }
        if (value_mask & XCB_CONFIG_WINDOW_HEIGHT) {
            nh = rh;
        }
        QSize ns = sizeForClientSize(QSize(nw, nh));     // enforces size if needed
        new_pos = rules()->checkPosition(new_pos);
        int newScreen = screens()->number(QRect(new_pos, ns).center());
        if (newScreen != rules()->checkScreen(newScreen))
            return; // not allowed by rule

        QRect origClientGeometry(pos() + clientPos(), clientSize());
        GeometryUpdatesBlocker blocker(this);
        move(new_pos);
        plainResize(ns);
        setFrameGeometry(QRect(calculateGravitation(false, gravity), size()));
        QRect area = workspace()->clientArea(WorkArea, this);
        if (!from_tool && (!isSpecialWindow() || isToolbar()) && !isFullScreen()
                && area.contains(origClientGeometry))
            keepInArea(area);

        // this is part of the kicker-xinerama-hack... it should be
        // safe to remove when kicker gets proper ExtendedStrut support;
        // see Workspace::updateClientArea() and
        // X11Client::adjustedClientArea()
        if (hasStrut())
            workspace() -> updateClientArea();
    }

    if (value_mask & configureSizeMask && !(value_mask & configurePositionMask)) {     // pure resize
        int nw = clientSize().width();
        int nh = clientSize().height();
        if (value_mask & XCB_CONFIG_WINDOW_WIDTH) {
            nw = rw;
        }
        if (value_mask & XCB_CONFIG_WINDOW_HEIGHT) {
            nh = rh;
        }
        QSize ns = sizeForClientSize(QSize(nw, nh));

        if (ns != size()) { // don't restore if some app sets its own size again
            QRect origClientGeometry(pos() + clientPos(), clientSize());
            GeometryUpdatesBlocker blocker(this);
            resizeWithChecks(ns, xcb_gravity_t(gravity));
            if (!from_tool && (!isSpecialWindow() || isToolbar()) && !isFullScreen()) {
                // try to keep the window in its xinerama screen if possible,
                // if that fails at least keep it visible somewhere
                QRect area = workspace()->clientArea(MovementArea, this);
                if (area.contains(origClientGeometry))
                    keepInArea(area);
                area = workspace()->clientArea(WorkArea, this);
                if (area.contains(origClientGeometry))
                    keepInArea(area);
            }
        }
    }
    geom_restore = frameGeometry();
    // No need to send synthetic configure notify event here, either it's sent together
    // with geometry change, or there's no need to send it.
    // Handling of the real ConfigureRequest event forces sending it, as there it's necessary.
}

void X11Client::resizeWithChecks(int w, int h, xcb_gravity_t gravity, ForceGeometry_t force)
{
    Q_ASSERT(!shade_geometry_change);
    if (isShade()) {
        if (h == borderTop() + borderBottom()) {
            qCWarning(KWIN_CORE) << "Shaded geometry passed for size:" ;
        }
    }
    int newx = x();
    int newy = y();
    QRect area = workspace()->clientArea(WorkArea, this);
    // don't allow growing larger than workarea
    if (w > area.width())
        w = area.width();
    if (h > area.height())
        h = area.height();
    QSize tmp = adjustedSize(QSize(w, h));    // checks size constraints, including min/max size
    w = tmp.width();
    h = tmp.height();
    if (gravity == 0) {
        gravity = m_geometryHints.windowGravity();
    }
    switch(gravity) {
    case XCB_GRAVITY_NORTH_WEST: // top left corner doesn't move
    default:
        break;
    case XCB_GRAVITY_NORTH: // middle of top border doesn't move
        newx = (newx + width() / 2) - (w / 2);
        break;
    case XCB_GRAVITY_NORTH_EAST: // top right corner doesn't move
        newx = newx + width() - w;
        break;
    case XCB_GRAVITY_WEST: // middle of left border doesn't move
        newy = (newy + height() / 2) - (h / 2);
        break;
    case XCB_GRAVITY_CENTER: // middle point doesn't move
        newx = (newx + width() / 2) - (w / 2);
        newy = (newy + height() / 2) - (h / 2);
        break;
    case XCB_GRAVITY_STATIC: // top left corner of _client_ window doesn't move
        // since decoration doesn't change, equal to NorthWestGravity
        break;
    case XCB_GRAVITY_EAST: // // middle of right border doesn't move
        newx = newx + width() - w;
        newy = (newy + height() / 2) - (h / 2);
        break;
    case XCB_GRAVITY_SOUTH_WEST: // bottom left corner doesn't move
        newy = newy + height() - h;
        break;
    case XCB_GRAVITY_SOUTH: // middle of bottom border doesn't move
        newx = (newx + width() / 2) - (w / 2);
        newy = newy + height() - h;
        break;
    case XCB_GRAVITY_SOUTH_EAST: // bottom right corner doesn't move
        newx = newx + width() - w;
        newy = newy + height() - h;
        break;
    }
    setFrameGeometry(newx, newy, w, h, force);
}

// _NET_MOVERESIZE_WINDOW
void X11Client::NETMoveResizeWindow(int flags, int x, int y, int width, int height)
{
    int gravity = flags & 0xff;
    int value_mask = 0;
    if (flags & (1 << 8)) {
        value_mask |= XCB_CONFIG_WINDOW_X;
    }
    if (flags & (1 << 9)) {
        value_mask |= XCB_CONFIG_WINDOW_Y;
    }
    if (flags & (1 << 10)) {
        value_mask |= XCB_CONFIG_WINDOW_WIDTH;
    }
    if (flags & (1 << 11)) {
        value_mask |= XCB_CONFIG_WINDOW_HEIGHT;
    }
    configureRequest(value_mask, x, y, width, height, gravity, true);
}

bool X11Client::isMovable() const
{
    if (!hasNETSupport() && !m_motif.move()) {
        return false;
    }
    if (isFullScreen())
        return false;
    if (isSpecialWindow() && !isSplash() && !isToolbar())  // allow moving of splashscreens :)
        return false;
    if (rules()->checkPosition(invalidPoint) != invalidPoint)     // forced position
        return false;
    return true;
}

bool X11Client::isMovableAcrossScreens() const
{
    if (!hasNETSupport() && !m_motif.move()) {
        return false;
    }
    if (isSpecialWindow() && !isSplash() && !isToolbar())  // allow moving of splashscreens :)
        return false;
    if (rules()->checkPosition(invalidPoint) != invalidPoint)     // forced position
        return false;
    return true;
}

bool X11Client::isResizable() const
{
    if (!hasNETSupport() && !m_motif.resize()) {
        return false;
    }
    if (isFullScreen())
        return false;
    if (isSpecialWindow() || isSplash() || isToolbar())
        return false;
    if (rules()->checkSize(QSize()).isValid())   // forced size
        return false;
    const Position mode = moveResizePointerMode();
    if ((mode == PositionTop || mode == PositionTopLeft || mode == PositionTopRight ||
         mode == PositionLeft || mode == PositionBottomLeft) && rules()->checkPosition(invalidPoint) != invalidPoint)
        return false;

    QSize min = minSize();
    QSize max = maxSize();
    return min.width() < max.width() || min.height() < max.height();
}

bool X11Client::isMaximizable() const
{
    if (!isResizable() || isToolbar())  // SELI isToolbar() ?
        return false;
    if (rules()->checkMaximize(MaximizeRestore) == MaximizeRestore && rules()->checkMaximize(MaximizeFull) != MaximizeRestore)
        return true;
    return false;
}


/**
 * Reimplemented to inform the client about the new window position.
 */
void X11Client::setFrameGeometry(int x, int y, int w, int h, ForceGeometry_t force)
{
    // this code is also duplicated in X11Client::plainResize()
    // Ok, the shading geometry stuff. Generally, code doesn't care about shaded geometry,
    // simply because there are too many places dealing with geometry. Those places
    // ignore shaded state and use normal geometry, which they usually should get
    // from adjustedSize(). Such geometry comes here, and if the window is shaded,
    // the geometry is used only for client_size, since that one is not used when
    // shading. Then the frame geometry is adjusted for the shaded geometry.
    // This gets more complicated in the case the code does only something like
    // setGeometry( geometry()) - geometry() will return the shaded frame geometry.
    // Such code is wrong and should be changed to handle the case when the window is shaded,
    // for example using X11Client::clientSize()

    if (shade_geometry_change)
        ; // nothing
    else if (isShade()) {
        if (h == borderTop() + borderBottom()) {
            qCDebug(KWIN_CORE) << "Shaded geometry passed for size:";
        } else {
            client_size = QSize(w - borderLeft() - borderRight(), h - borderTop() - borderBottom());
            h = borderTop() + borderBottom();
        }
    } else {
        client_size = QSize(w - borderLeft() - borderRight(), h - borderTop() - borderBottom());
    }
    QRect g(x, y, w, h);
    if (!areGeometryUpdatesBlocked() && g != rules()->checkGeometry(g)) {
        qCDebug(KWIN_CORE) << "forced geometry fail:" << g << ":" << rules()->checkGeometry(g);
    }
    if (force == NormalGeometrySet && geom == g && pendingGeometryUpdate() == PendingGeometryNone)
        return;
    geom = g;
    if (areGeometryUpdatesBlocked()) {
        if (pendingGeometryUpdate() == PendingGeometryForced)
            {} // maximum, nothing needed
        else if (force == ForceGeometrySet)
            setPendingGeometryUpdate(PendingGeometryForced);
        else
            setPendingGeometryUpdate(PendingGeometryNormal);
        return;
    }
    QSize oldClientSize = m_frame.geometry().size();
    bool resized = (geometryBeforeUpdateBlocking().size() != geom.size() || pendingGeometryUpdate() == PendingGeometryForced);
    if (resized) {
        resizeDecoration();
        m_frame.setGeometry(x, y, w, h);
        if (!isShade()) {
            QSize cs = clientSize();
            m_wrapper.setGeometry(QRect(clientPos(), cs));
            if (!isResize() || syncRequest.counter == XCB_NONE)
                m_client.setGeometry(0, 0, cs.width(), cs.height());
            // SELI - won't this be too expensive?
            // THOMAS - yes, but gtk+ clients will not resize without ...
            sendSyntheticConfigureNotify();
        }
        updateShape();
    } else {
        if (isMoveResize()) {
            if (compositing())  // Defer the X update until we leave this mode
                needsXWindowMove = true;
            else
                m_frame.move(x, y); // sendSyntheticConfigureNotify() on finish shall be sufficient
        } else {
            m_frame.move(x, y);
            sendSyntheticConfigureNotify();
        }

        // Unconditionally move the input window: it won't affect rendering
        m_decoInputExtent.move(QPoint(x, y) + inputPos());
    }
    updateWindowRules(Rules::Position|Rules::Size);

    // keep track of old maximize mode
    // to detect changes
    screens()->setCurrent(this);
    workspace()->updateStackingOrder();

    // need to regenerate decoration pixmaps when
    // - size is changed
    if (resized) {
        if (oldClientSize != QSize(w,h))
            discardWindowPixmap();
    }
    emit geometryShapeChanged(this, geometryBeforeUpdateBlocking());
    addRepaintDuringGeometryUpdates();
    updateGeometryBeforeUpdateBlocking();
    // TODO: this signal is emitted too often
    emit geometryChanged();
}

void X11Client::plainResize(int w, int h, ForceGeometry_t force)
{
    // this code is also duplicated in X11Client::setGeometry(), and it's also commented there
    if (shade_geometry_change)
        ; // nothing
    else if (isShade()) {
        if (h == borderTop() + borderBottom()) {
            qCDebug(KWIN_CORE) << "Shaded geometry passed for size:";
        } else {
            client_size = QSize(w - borderLeft() - borderRight(), h - borderTop() - borderBottom());
            h = borderTop() + borderBottom();
        }
    } else {
        client_size = QSize(w - borderLeft() - borderRight(), h - borderTop() - borderBottom());
    }
    QSize s(w, h);
    if (!areGeometryUpdatesBlocked() && s != rules()->checkSize(s)) {
        qCDebug(KWIN_CORE) << "forced size fail:" << s << ":" << rules()->checkSize(s);
    }
    // resuming geometry updates is handled only in setGeometry()
    Q_ASSERT(pendingGeometryUpdate() == PendingGeometryNone || areGeometryUpdatesBlocked());
    if (force == NormalGeometrySet && geom.size() == s)
        return;
    geom.setSize(s);
    if (areGeometryUpdatesBlocked()) {
        if (pendingGeometryUpdate() == PendingGeometryForced)
            {} // maximum, nothing needed
        else if (force == ForceGeometrySet)
            setPendingGeometryUpdate(PendingGeometryForced);
        else
            setPendingGeometryUpdate(PendingGeometryNormal);
        return;
    }
    QSize oldClientSize = m_frame.geometry().size();
    resizeDecoration();
    m_frame.resize(w, h);
//     resizeDecoration( s );
    if (!isShade()) {
        QSize cs = clientSize();
        m_wrapper.setGeometry(QRect(clientPos(), cs));
        m_client.setGeometry(0, 0, cs.width(), cs.height());
    }
    updateShape();

    sendSyntheticConfigureNotify();
    updateWindowRules(Rules::Position|Rules::Size);
    screens()->setCurrent(this);
    workspace()->updateStackingOrder();
    if (oldClientSize != QSize(w,h))
        discardWindowPixmap();
    emit geometryShapeChanged(this, geometryBeforeUpdateBlocking());
    addRepaintDuringGeometryUpdates();
    updateGeometryBeforeUpdateBlocking();
    // TODO: this signal is emitted too often
    emit geometryChanged();
}

/**
 * Reimplemented to inform the client about the new window position.
 */
void AbstractClient::move(int x, int y, ForceGeometry_t force)
{
    // resuming geometry updates is handled only in setGeometry()
    Q_ASSERT(pendingGeometryUpdate() == PendingGeometryNone || areGeometryUpdatesBlocked());
    QPoint p(x, y);
    if (!areGeometryUpdatesBlocked() && p != rules()->checkPosition(p)) {
        qCDebug(KWIN_CORE) << "forced position fail:" << p << ":" << rules()->checkPosition(p);
    }
    if (force == NormalGeometrySet && geom.topLeft() == p)
        return;
    geom.moveTopLeft(p);
    if (areGeometryUpdatesBlocked()) {
        if (pendingGeometryUpdate() == PendingGeometryForced)
            {} // maximum, nothing needed
        else if (force == ForceGeometrySet)
            setPendingGeometryUpdate(PendingGeometryForced);
        else
            setPendingGeometryUpdate(PendingGeometryNormal);
        return;
    }
    doMove(x, y);
    updateWindowRules(Rules::Position);
    screens()->setCurrent(this);
    workspace()->updateStackingOrder();
    // client itself is not damaged
    addRepaintDuringGeometryUpdates();
    updateGeometryBeforeUpdateBlocking();
    emit geometryChanged();
}

void X11Client::doMove(int x, int y)
{
    m_frame.move(x, y);
    sendSyntheticConfigureNotify();
}

void AbstractClient::blockGeometryUpdates(bool block)
{
    if (block) {
        if (m_blockGeometryUpdates == 0)
            m_pendingGeometryUpdate = PendingGeometryNone;
        ++m_blockGeometryUpdates;
    } else {
        if (--m_blockGeometryUpdates == 0) {
            if (m_pendingGeometryUpdate != PendingGeometryNone) {
                if (isShade())
                    setFrameGeometry(QRect(pos(), adjustedSize()), NormalGeometrySet);
                else
                    setFrameGeometry(frameGeometry(), NormalGeometrySet);
                m_pendingGeometryUpdate = PendingGeometryNone;
            }
        }
    }
}

void AbstractClient::maximize(MaximizeMode m)
{
    setMaximize(m & MaximizeVertical, m & MaximizeHorizontal);
}

void AbstractClient::setMaximize(bool vertically, bool horizontally)
{
    // changeMaximize() flips the state, so change from set->flip
    const MaximizeMode oldMode = maximizeMode();
    changeMaximize(
        oldMode & MaximizeHorizontal ? !horizontally : horizontally,
        oldMode & MaximizeVertical ? !vertically : vertically,
        false);
    const MaximizeMode newMode = maximizeMode();
    if (oldMode != newMode) {
        emit clientMaximizedStateChanged(this, newMode);
        emit clientMaximizedStateChanged(this, vertically, horizontally);
    }

}

static bool changeMaximizeRecursion = false;
void X11Client::changeMaximize(bool horizontal, bool vertical, bool adjust)
{
    if (changeMaximizeRecursion)
        return;

    if (!isResizable() || isToolbar())  // SELI isToolbar() ?
        return;

    QRect clientArea;
    if (isElectricBorderMaximizing())
        clientArea = workspace()->clientArea(MaximizeArea, Cursor::pos(), desktop());
    else
        clientArea = workspace()->clientArea(MaximizeArea, this);

    MaximizeMode old_mode = max_mode;
    // 'adjust == true' means to update the size only, e.g. after changing workspace size
    if (!adjust) {
        if (vertical)
            max_mode = MaximizeMode(max_mode ^ MaximizeVertical);
        if (horizontal)
            max_mode = MaximizeMode(max_mode ^ MaximizeHorizontal);
    }

    // if the client insist on a fix aspect ratio, we check whether the maximizing will get us
    // out of screen bounds and take that as a "full maximization with aspect check" then
    if (m_geometryHints.hasAspect() && // fixed aspect
        (max_mode == MaximizeVertical || max_mode == MaximizeHorizontal) && // ondimensional maximization
        rules()->checkStrictGeometry(true)) { // obey aspect
        const QSize minAspect = m_geometryHints.minAspect();
        const QSize maxAspect = m_geometryHints.maxAspect();
        if (max_mode == MaximizeVertical || (old_mode & MaximizeVertical)) {
            const double fx = minAspect.width(); // use doubles, because the values can be MAX_INT
            const double fy = maxAspect.height(); // use doubles, because the values can be MAX_INT
            if (fx*clientArea.height()/fy > clientArea.width()) // too big
                max_mode = old_mode & MaximizeHorizontal ? MaximizeRestore : MaximizeFull;
        } else { // max_mode == MaximizeHorizontal
            const double fx = maxAspect.width();
            const double fy = minAspect.height();
            if (fy*clientArea.width()/fx > clientArea.height()) // too big
                max_mode = old_mode & MaximizeVertical ? MaximizeRestore : MaximizeFull;
        }
    }

    max_mode = rules()->checkMaximize(max_mode);
    if (!adjust && max_mode == old_mode)
        return;

    GeometryUpdatesBlocker blocker(this);

    // maximing one way and unmaximizing the other way shouldn't happen,
    // so restore first and then maximize the other way
    if ((old_mode == MaximizeVertical && max_mode == MaximizeHorizontal)
            || (old_mode == MaximizeHorizontal && max_mode == MaximizeVertical)) {
        changeMaximize(false, false, false);   // restore
    }

    // save sizes for restoring, if maximalizing
    QSize sz;
    if (isShade())
        sz = sizeForClientSize(clientSize());
    else
        sz = size();

    if (quickTileMode() == QuickTileMode(QuickTileFlag::None)) {
        if (!adjust && !(old_mode & MaximizeVertical)) {
            geom_restore.setTop(y());
            geom_restore.setHeight(sz.height());
        }
        if (!adjust && !(old_mode & MaximizeHorizontal)) {
            geom_restore.setLeft(x());
            geom_restore.setWidth(sz.width());
        }
    }

    // call into decoration update borders
    if (isDecorated() && decoration()->client() && !(options->borderlessMaximizedWindows() && max_mode == KWin::MaximizeFull)) {
        changeMaximizeRecursion = true;
        const auto c = decoration()->client().data();
        if ((max_mode & MaximizeVertical) != (old_mode & MaximizeVertical)) {
            emit c->maximizedVerticallyChanged(max_mode & MaximizeVertical);
        }
        if ((max_mode & MaximizeHorizontal) != (old_mode & MaximizeHorizontal)) {
            emit c->maximizedHorizontallyChanged(max_mode & MaximizeHorizontal);
        }
        if ((max_mode == MaximizeFull) != (old_mode == MaximizeFull)) {
            emit c->maximizedChanged(max_mode & MaximizeFull);
        }
        changeMaximizeRecursion = false;
    }

    if (options->borderlessMaximizedWindows()) {
        // triggers a maximize change.
        // The next setNoBorder interation will exit since there's no change but the first recursion pullutes the restore geometry
        changeMaximizeRecursion = true;
        setNoBorder(rules()->checkNoBorder(app_noborder || (m_motif.hasDecoration() && m_motif.noBorder()) || max_mode == MaximizeFull));
        changeMaximizeRecursion = false;
    }

    const ForceGeometry_t geom_mode = isDecorated() ? ForceGeometrySet : NormalGeometrySet;

    // Conditional quick tiling exit points
    if (quickTileMode() != QuickTileMode(QuickTileFlag::None)) {
        if (old_mode == MaximizeFull &&
                !clientArea.contains(geom_restore.center())) {
            // Not restoring on the same screen
            // TODO: The following doesn't work for some reason
            //quick_tile_mode = QuickTileFlag::None; // And exit quick tile mode manually
        } else if ((old_mode == MaximizeVertical && max_mode == MaximizeRestore) ||
                  (old_mode == MaximizeFull && max_mode == MaximizeHorizontal)) {
            // Modifying geometry of a tiled window
            updateQuickTileMode(QuickTileFlag::None); // Exit quick tile mode without restoring geometry
        }
    }

    switch(max_mode) {

    case MaximizeVertical: {
        if (old_mode & MaximizeHorizontal) { // actually restoring from MaximizeFull
            if (geom_restore.width() == 0 || !clientArea.contains(geom_restore.center())) {
                // needs placement
                plainResize(adjustedSize(QSize(width() * 2 / 3, clientArea.height()), SizemodeFixedH), geom_mode);
                Placement::self()->placeSmart(this, clientArea);
            } else {
                setFrameGeometry(QRect(QPoint(geom_restore.x(), clientArea.top()),
                                       adjustedSize(QSize(geom_restore.width(), clientArea.height()), SizemodeFixedH)), geom_mode);
            }
        } else {
            QRect r(x(), clientArea.top(), width(), clientArea.height());
            r.setTopLeft(rules()->checkPosition(r.topLeft()));
            r.setSize(adjustedSize(r.size(), SizemodeFixedH));
            setFrameGeometry(r, geom_mode);
        }
        info->setState(NET::MaxVert, NET::Max);
        break;
    }

    case MaximizeHorizontal: {
        if (old_mode & MaximizeVertical) { // actually restoring from MaximizeFull
            if (geom_restore.height() == 0 || !clientArea.contains(geom_restore.center())) {
                // needs placement
                plainResize(adjustedSize(QSize(clientArea.width(), height() * 2 / 3), SizemodeFixedW), geom_mode);
                Placement::self()->placeSmart(this, clientArea);
            } else {
                setFrameGeometry(QRect(QPoint(clientArea.left(), geom_restore.y()),
                                       adjustedSize(QSize(clientArea.width(), geom_restore.height()), SizemodeFixedW)), geom_mode);
            }
        } else {
            QRect r(clientArea.left(), y(), clientArea.width(), height());
            r.setTopLeft(rules()->checkPosition(r.topLeft()));
            r.setSize(adjustedSize(r.size(), SizemodeFixedW));
            setFrameGeometry(r, geom_mode);
        }
        info->setState(NET::MaxHoriz, NET::Max);
        break;
    }

    case MaximizeRestore: {
        QRect restore = frameGeometry();
        // when only partially maximized, geom_restore may not have the other dimension remembered
        if (old_mode & MaximizeVertical) {
            restore.setTop(geom_restore.top());
            restore.setBottom(geom_restore.bottom());
        }
        if (old_mode & MaximizeHorizontal) {
            restore.setLeft(geom_restore.left());
            restore.setRight(geom_restore.right());
        }
        if (!restore.isValid()) {
            QSize s = QSize(clientArea.width() * 2 / 3, clientArea.height() * 2 / 3);
            if (geom_restore.width() > 0)
                s.setWidth(geom_restore.width());
            if (geom_restore.height() > 0)
                s.setHeight(geom_restore.height());
            plainResize(adjustedSize(s));
            Placement::self()->placeSmart(this, clientArea);
            restore = frameGeometry();
            if (geom_restore.width() > 0)
                restore.moveLeft(geom_restore.x());
            if (geom_restore.height() > 0)
                restore.moveTop(geom_restore.y());
            geom_restore = restore; // relevant for mouse pos calculation, bug #298646
        }
        if (m_geometryHints.hasAspect()) {
            restore.setSize(adjustedSize(restore.size(), SizemodeAny));
        }
        setFrameGeometry(restore, geom_mode);
        if (!clientArea.contains(geom_restore.center()))    // Not restoring to the same screen
            Placement::self()->place(this, clientArea);
        info->setState(NET::States(), NET::Max);
        updateQuickTileMode(QuickTileFlag::None);
        break;
    }

    case MaximizeFull: {
        QRect r(clientArea);
        r.setTopLeft(rules()->checkPosition(r.topLeft()));
        r.setSize(adjustedSize(r.size(), SizemodeMax));
        if (r.size() != clientArea.size()) { // to avoid off-by-one errors...
            if (isElectricBorderMaximizing() && r.width() < clientArea.width()) {
                r.moveLeft(qMax(clientArea.left(), Cursor::pos().x() - r.width()/2));
                r.moveRight(qMin(clientArea.right(), r.right()));
            } else {
                r.moveCenter(clientArea.center());
                const bool closeHeight = r.height() > 97*clientArea.height()/100;
                const bool closeWidth  = r.width()  > 97*clientArea.width() /100;
                const bool overHeight = r.height() > clientArea.height();
                const bool overWidth  = r.width()  > clientArea.width();
                if (closeWidth || closeHeight) {
                    Position titlePos = titlebarPosition();
                    const QRect screenArea = workspace()->clientArea(ScreenArea, clientArea.center(), desktop());
                    if (closeHeight) {
                        bool tryBottom = titlePos == PositionBottom;
                        if ((overHeight && titlePos == PositionTop) ||
                            screenArea.top() == clientArea.top())
                            r.setTop(clientArea.top());
                        else
                            tryBottom = true;
                        if (tryBottom &&
                            (overHeight || screenArea.bottom() == clientArea.bottom()))
                            r.setBottom(clientArea.bottom());
                    }
                    if (closeWidth) {
                        bool tryLeft = titlePos == PositionLeft;
                        if ((overWidth && titlePos == PositionRight) ||
                            screenArea.right() == clientArea.right())
                            r.setRight(clientArea.right());
                        else
                            tryLeft = true;
                        if (tryLeft && (overWidth || screenArea.left() == clientArea.left()))
                            r.setLeft(clientArea.left());
                    }
                }
            }
            r.moveTopLeft(rules()->checkPosition(r.topLeft()));
        }
        setFrameGeometry(r, geom_mode);
        if (options->electricBorderMaximize() && r.top() == clientArea.top())
            updateQuickTileMode(QuickTileFlag::Maximize);
        else
            updateQuickTileMode(QuickTileFlag::None);
        info->setState(NET::Max, NET::Max);
        break;
    }
    default:
        break;
    }

    updateAllowedActions();
    updateWindowRules(Rules::MaximizeVert|Rules::MaximizeHoriz|Rules::Position|Rules::Size);
    emit quickTileModeChanged();
}

bool X11Client::userCanSetFullScreen() const
{
    if (!isFullScreenable()) {
        return false;
    }
    return isNormalWindow() || isDialog();
}

void X11Client::setFullScreen(bool set, bool user)
{
    set = rules()->checkFullScreen(set);

    const bool wasFullscreen = isFullScreen();
    if (wasFullscreen == set) {
        return;
    }
    if (user && !userCanSetFullScreen()) {
        return;
    }

    setShade(ShadeNone);

    if (wasFullscreen) {
        workspace()->updateFocusMousePosition(Cursor::pos()); // may cause leave event
    } else {
        geom_fs_restore = frameGeometry();
    }

    if (set) {
        m_fullscreenMode = FullScreenNormal;
        workspace()->raiseClient(this);
    } else {
        m_fullscreenMode = FullScreenNone;
    }

    StackingUpdatesBlocker blocker1(workspace());
    GeometryUpdatesBlocker blocker2(this);

    // active fullscreens get different layer
    workspace()->updateClientLayer(this);

    info->setState(isFullScreen() ? NET::FullScreen : NET::States(), NET::FullScreen);
    updateDecoration(false, false);

    if (set) {
        if (info->fullscreenMonitors().isSet()) {
            setFrameGeometry(fullscreenMonitorsArea(info->fullscreenMonitors()));
        } else {
            setFrameGeometry(workspace()->clientArea(FullScreenArea, this));
        }
    } else {
        Q_ASSERT(!geom_fs_restore.isNull());
        const int currentScreen = screen();
        setFrameGeometry(QRect(geom_fs_restore.topLeft(), adjustedSize(geom_fs_restore.size())));
        if(currentScreen != screen()) {
            workspace()->sendClientToScreen(this, currentScreen);
        }
    }

    updateWindowRules(Rules::Fullscreen | Rules::Position | Rules::Size);
    emit clientFullScreenSet(this, set, user);
    emit fullScreenChanged();
}


void X11Client::updateFullscreenMonitors(NETFullscreenMonitors topology)
{
    int nscreens = screens()->count();

//    qDebug() << "incoming request with top: " << topology.top << " bottom: " << topology.bottom
//                   << " left: " << topology.left << " right: " << topology.right
//                   << ", we have: " << nscreens << " screens.";

    if (topology.top >= nscreens ||
            topology.bottom >= nscreens ||
            topology.left >= nscreens ||
            topology.right >= nscreens) {
        qCWarning(KWIN_CORE) << "fullscreenMonitors update failed. request higher than number of screens.";
        return;
    }

    info->setFullscreenMonitors(topology);
    if (isFullScreen())
        setFrameGeometry(fullscreenMonitorsArea(topology));
}

/**
 * Calculates the bounding rectangle defined by the 4 monitor indices indicating the
 * top, bottom, left, and right edges of the window when the fullscreen state is enabled.
 */
QRect X11Client::fullscreenMonitorsArea(NETFullscreenMonitors requestedTopology) const
{
    QRect top, bottom, left, right, total;

    top = screens()->geometry(requestedTopology.top);
    bottom = screens()->geometry(requestedTopology.bottom);
    left = screens()->geometry(requestedTopology.left);
    right = screens()->geometry(requestedTopology.right);
    total = top.united(bottom.united(left.united(right)));

//    qDebug() << "top: " << top << " bottom: " << bottom
//                   << " left: " << left << " right: " << right;
//    qDebug() << "returning rect: " << total;
    return total;
}

static GeometryTip* geometryTip    = nullptr;

void X11Client::positionGeometryTip()
{
    Q_ASSERT(isMove() || isResize());
    // Position and Size display
    if (effects && static_cast<EffectsHandlerImpl*>(effects)->provides(Effect::GeometryTip))
        return; // some effect paints this for us
    if (options->showGeometryTip()) {
        if (!geometryTip) {
            geometryTip = new GeometryTip(&m_geometryHints);
        }
        QRect wgeom(moveResizeGeometry());   // position of the frame, size of the window itself
        wgeom.setWidth(wgeom.width() - (width() - clientSize().width()));
        wgeom.setHeight(wgeom.height() - (height() - clientSize().height()));
        if (isShade())
            wgeom.setHeight(0);
        geometryTip->setGeometry(wgeom);
        if (!geometryTip->isVisible())
            geometryTip->show();
        geometryTip->raise();
    }
}

bool AbstractClient::startMoveResize()
{
    Q_ASSERT(!isMoveResize());
    Q_ASSERT(QWidget::keyboardGrabber() == nullptr);
    Q_ASSERT(QWidget::mouseGrabber() == nullptr);
    stopDelayedMoveResize();
    if (QApplication::activePopupWidget() != nullptr)
        return false; // popups have grab
    if (isFullScreen() && (screens()->count() < 2 || !isMovableAcrossScreens()))
        return false;
    if (!doStartMoveResize()) {
        return false;
    }

    invalidateDecorationDoubleClickTimer();

    setMoveResize(true);
    workspace()->setMoveResizeClient(this);

    const Position mode = moveResizePointerMode();
    if (mode != PositionCenter) { // means "isResize()" but moveResizeMode = true is set below
        if (maximizeMode() == MaximizeFull) { // partial is cond. reset in finishMoveResize
            setGeometryRestore(frameGeometry()); // "restore" to current geometry
            setMaximize(false, false);
        }
    }

    if (quickTileMode() != QuickTileMode(QuickTileFlag::None) && mode != PositionCenter) { // Cannot use isResize() yet
        // Exit quick tile mode when the user attempts to resize a tiled window
        updateQuickTileMode(QuickTileFlag::None); // Do so without restoring original geometry
        setGeometryRestore(frameGeometry());
        emit quickTileModeChanged();
    }

    updateHaveResizeEffect();
    updateInitialMoveResizeGeometry();
    checkUnrestrictedMoveResize();
    emit clientStartUserMovedResized(this);
    if (ScreenEdges::self()->isDesktopSwitchingMovingClients())
        ScreenEdges::self()->reserveDesktopSwitching(true, Qt::Vertical|Qt::Horizontal);
    return true;
}

bool X11Client::doStartMoveResize()
{
    bool has_grab = false;
    // This reportedly improves smoothness of the moveresize operation,
    // something with Enter/LeaveNotify events, looks like XFree performance problem or something *shrug*
    // (https://lists.kde.org/?t=107302193400001&r=1&w=2)
    QRect r = workspace()->clientArea(FullArea, this);
    m_moveResizeGrabWindow.create(r, XCB_WINDOW_CLASS_INPUT_ONLY, 0, nullptr, rootWindow());
    m_moveResizeGrabWindow.map();
    m_moveResizeGrabWindow.raise();
    updateXTime();
    const xcb_grab_pointer_cookie_t cookie = xcb_grab_pointer_unchecked(connection(), false, m_moveResizeGrabWindow,
        XCB_EVENT_MASK_BUTTON_PRESS | XCB_EVENT_MASK_BUTTON_RELEASE | XCB_EVENT_MASK_POINTER_MOTION |
        XCB_EVENT_MASK_ENTER_WINDOW | XCB_EVENT_MASK_LEAVE_WINDOW,
        XCB_GRAB_MODE_ASYNC, XCB_GRAB_MODE_ASYNC, m_moveResizeGrabWindow, Cursor::x11Cursor(cursor()), xTime());
    ScopedCPointer<xcb_grab_pointer_reply_t> pointerGrab(xcb_grab_pointer_reply(connection(), cookie, nullptr));
    if (!pointerGrab.isNull() && pointerGrab->status == XCB_GRAB_STATUS_SUCCESS) {
        has_grab = true;
    }
    if (!has_grab && grabXKeyboard(frameId()))
        has_grab = move_resize_has_keyboard_grab = true;
    if (!has_grab) { // at least one grab is necessary in order to be able to finish move/resize
        m_moveResizeGrabWindow.reset();
        return false;
    }
    return true;
}

void AbstractClient::finishMoveResize(bool cancel)
{
    GeometryUpdatesBlocker blocker(this);
    const bool wasResize = isResize(); // store across leaveMoveResize
    leaveMoveResize();

    if (cancel)
        setFrameGeometry(initialMoveResizeGeometry());
    else {
        const QRect &moveResizeGeom = moveResizeGeometry();
        if (wasResize) {
            const bool restoreH = maximizeMode() == MaximizeHorizontal &&
                                    moveResizeGeom.width() != initialMoveResizeGeometry().width();
            const bool restoreV = maximizeMode() == MaximizeVertical &&
                                    moveResizeGeom.height() != initialMoveResizeGeometry().height();
            if (restoreH || restoreV) {
                changeMaximize(restoreV, restoreH, false);
            }
        }
        setFrameGeometry(moveResizeGeom);
    }
    checkScreen(); // needs to be done because clientFinishUserMovedResized has not yet re-activated online alignment
    if (screen() != moveResizeStartScreen()) {
        workspace()->sendClientToScreen(this, screen()); // checks rule validity
        if (maximizeMode() != MaximizeRestore)
            checkWorkspacePosition();
    }

    if (isElectricBorderMaximizing()) {
        setQuickTileMode(electricBorderMode());
        setElectricBorderMaximizing(false);
    } else if (!cancel) {
        QRect geom_restore = geometryRestore();
        if (!(maximizeMode() & MaximizeHorizontal)) {
            geom_restore.setX(frameGeometry().x());
            geom_restore.setWidth(frameGeometry().width());
        }
        if (!(maximizeMode() & MaximizeVertical)) {
            geom_restore.setY(frameGeometry().y());
            geom_restore.setHeight(frameGeometry().height());
        }
        setGeometryRestore(geom_restore);
    }
// FRAME    update();

    emit clientFinishUserMovedResized(this);
}

void X11Client::leaveMoveResize()
{
    if (needsXWindowMove) {
        // Do the deferred move
        m_frame.move(geom.topLeft());
        needsXWindowMove = false;
    }
    if (!isResize())
        sendSyntheticConfigureNotify(); // tell the client about it's new final position
    if (geometryTip) {
        geometryTip->hide();
        delete geometryTip;
        geometryTip = nullptr;
    }
    if (move_resize_has_keyboard_grab)
        ungrabXKeyboard();
    move_resize_has_keyboard_grab = false;
    xcb_ungrab_pointer(connection(), xTime());
    m_moveResizeGrabWindow.reset();
    if (syncRequest.counter == XCB_NONE) // don't forget to sanitize since the timeout will no more fire
        syncRequest.isPending = false;
    delete syncRequest.timeout;
    syncRequest.timeout = nullptr;
    AbstractClient::leaveMoveResize();
}

// This function checks if it actually makes sense to perform a restricted move/resize.
// If e.g. the titlebar is already outside of the workarea, there's no point in performing
// a restricted move resize, because then e.g. resize would also move the window (#74555).
// NOTE: Most of it is duplicated from handleMoveResize().
void AbstractClient::checkUnrestrictedMoveResize()
{
    if (isUnrestrictedMoveResize())
        return;
    const QRect &moveResizeGeom = moveResizeGeometry();
    QRect desktopArea = workspace()->clientArea(WorkArea, moveResizeGeom.center(), desktop());
    int left_marge, right_marge, top_marge, bottom_marge, titlebar_marge;
    // restricted move/resize - keep at least part of the titlebar always visible
    // how much must remain visible when moved away in that direction
    left_marge = qMin(100 + borderRight(), moveResizeGeom.width());
    right_marge = qMin(100 + borderLeft(), moveResizeGeom.width());
    // width/height change with opaque resizing, use the initial ones
    titlebar_marge = initialMoveResizeGeometry().height();
    top_marge = borderBottom();
    bottom_marge = borderTop();
    if (isResize()) {
        if (moveResizeGeom.bottom() < desktopArea.top() + top_marge)
            setUnrestrictedMoveResize(true);
        if (moveResizeGeom.top() > desktopArea.bottom() - bottom_marge)
            setUnrestrictedMoveResize(true);
        if (moveResizeGeom.right() < desktopArea.left() + left_marge)
            setUnrestrictedMoveResize(true);
        if (moveResizeGeom.left() > desktopArea.right() - right_marge)
            setUnrestrictedMoveResize(true);
        if (!isUnrestrictedMoveResize() && moveResizeGeom.top() < desktopArea.top())   // titlebar mustn't go out
            setUnrestrictedMoveResize(true);
    }
    if (isMove()) {
        if (moveResizeGeom.bottom() < desktopArea.top() + titlebar_marge - 1)
            setUnrestrictedMoveResize(true);
        // no need to check top_marge, titlebar_marge already handles it
        if (moveResizeGeom.top() > desktopArea.bottom() - bottom_marge + 1) // titlebar mustn't go out
            setUnrestrictedMoveResize(true);
        if (moveResizeGeom.right() < desktopArea.left() + left_marge)
            setUnrestrictedMoveResize(true);
        if (moveResizeGeom.left() > desktopArea.right() - right_marge)
            setUnrestrictedMoveResize(true);
    }
}

// When the user pressed mouse on the titlebar, don't activate move immediatelly,
// since it may be just a click. Activate instead after a delay. Move used to be
// activated only after moving by several pixels, but that looks bad.
void AbstractClient::startDelayedMoveResize()
{
    Q_ASSERT(!m_moveResize.delayedTimer);
    m_moveResize.delayedTimer = new QTimer(this);
    m_moveResize.delayedTimer->setSingleShot(true);
    connect(m_moveResize.delayedTimer, &QTimer::timeout, this,
        [this]() {
            Q_ASSERT(isMoveResizePointerButtonDown());
            if (!startMoveResize()) {
                setMoveResizePointerButtonDown(false);
            }
            updateCursor();
            stopDelayedMoveResize();
        }
    );
    m_moveResize.delayedTimer->start(QApplication::startDragTime());
}

void AbstractClient::stopDelayedMoveResize()
{
    delete m_moveResize.delayedTimer;
    m_moveResize.delayedTimer = nullptr;
}

void AbstractClient::handleMoveResize(const QPoint &local, const QPoint &global)
{
    const QRect oldGeo = frameGeometry();
    handleMoveResize(local.x(), local.y(), global.x(), global.y());
    if (!isFullScreen() && isMove()) {
        if (quickTileMode() != QuickTileMode(QuickTileFlag::None) && oldGeo != frameGeometry()) {
            GeometryUpdatesBlocker blocker(this);
            setQuickTileMode(QuickTileFlag::None);
            const QRect &geom_restore = geometryRestore();
            setMoveOffset(QPoint(double(moveOffset().x()) / double(oldGeo.width()) * double(geom_restore.width()),
                                 double(moveOffset().y()) / double(oldGeo.height()) * double(geom_restore.height())));
            if (rules()->checkMaximize(MaximizeRestore) == MaximizeRestore)
                setMoveResizeGeometry(geom_restore);
            handleMoveResize(local.x(), local.y(), global.x(), global.y()); // fix position
        } else if (quickTileMode() == QuickTileMode(QuickTileFlag::None) && isResizable()) {
            checkQuickTilingMaximizationZones(global.x(), global.y());
        }
    }
}

bool X11Client::isWaitingForMoveResizeSync() const
{
    return syncRequest.isPending && isResize();
}

void AbstractClient::handleMoveResize(int x, int y, int x_root, int y_root)
{
    if (isWaitingForMoveResizeSync())
        return; // we're still waiting for the client or the timeout

    const Position mode = moveResizePointerMode();
    if ((mode == PositionCenter && !isMovableAcrossScreens())
            || (mode != PositionCenter && (isShade() || !isResizable())))
        return;

    if (!isMoveResize()) {
        QPoint p(QPoint(x/* - padding_left*/, y/* - padding_top*/) - moveOffset());
        if (p.manhattanLength() >= QApplication::startDragDistance()) {
            if (!startMoveResize()) {
                setMoveResizePointerButtonDown(false);
                updateCursor();
                return;
            }
            updateCursor();
        } else
            return;
    }

    // ShadeHover or ShadeActive, ShadeNormal was already avoided above
    if (mode != PositionCenter && shadeMode() != ShadeNone)
        setShade(ShadeNone);

    QPoint globalPos(x_root, y_root);
    // these two points limit the geometry rectangle, i.e. if bottomleft resizing is done,
    // the bottomleft corner should be at is at (topleft.x(), bottomright().y())
    QPoint topleft = globalPos - moveOffset();
    QPoint bottomright = globalPos + invertedMoveOffset();
    QRect previousMoveResizeGeom = moveResizeGeometry();

    // TODO move whole group when moving its leader or when the leader is not mapped?

    auto titleBarRect = [this](bool &transposed, int &requiredPixels) -> QRect {
        const QRect &moveResizeGeom = moveResizeGeometry();
        QRect r(moveResizeGeom);
        r.moveTopLeft(QPoint(0,0));
        switch (titlebarPosition()) {
        default:
        case PositionTop:
            r.setHeight(borderTop());
            break;
        case PositionLeft:
            r.setWidth(borderLeft());
            transposed = true;
            break;
        case PositionBottom:
            r.setTop(r.bottom() - borderBottom());
            break;
        case PositionRight:
            r.setLeft(r.right() - borderRight());
            transposed = true;
            break;
        }
        // When doing a restricted move we must always keep 100px of the titlebar
        // visible to allow the user to be able to move it again.
        requiredPixels = qMin(100 * (transposed ? r.width() : r.height()),
                              moveResizeGeom.width() * moveResizeGeom.height());
        return r;
    };

    bool update = false;
    if (isResize()) {
        QRect orig = initialMoveResizeGeometry();
        Sizemode sizemode = SizemodeAny;
        auto calculateMoveResizeGeom = [this, &topleft, &bottomright, &orig, &sizemode, &mode]() {
            switch(mode) {
            case PositionTopLeft:
                setMoveResizeGeometry(QRect(topleft, orig.bottomRight()));
                break;
            case PositionBottomRight:
                setMoveResizeGeometry(QRect(orig.topLeft(), bottomright));
                break;
            case PositionBottomLeft:
                setMoveResizeGeometry(QRect(QPoint(topleft.x(), orig.y()), QPoint(orig.right(), bottomright.y())));
                break;
            case PositionTopRight:
                setMoveResizeGeometry(QRect(QPoint(orig.x(), topleft.y()), QPoint(bottomright.x(), orig.bottom())));
                break;
            case PositionTop:
                setMoveResizeGeometry(QRect(QPoint(orig.left(), topleft.y()), orig.bottomRight()));
                sizemode = SizemodeFixedH; // try not to affect height
                break;
            case PositionBottom:
                setMoveResizeGeometry(QRect(orig.topLeft(), QPoint(orig.right(), bottomright.y())));
                sizemode = SizemodeFixedH;
                break;
            case PositionLeft:
                setMoveResizeGeometry(QRect(QPoint(topleft.x(), orig.top()), orig.bottomRight()));
                sizemode = SizemodeFixedW;
                break;
            case PositionRight:
                setMoveResizeGeometry(QRect(orig.topLeft(), QPoint(bottomright.x(), orig.bottom())));
                sizemode = SizemodeFixedW;
                break;
            case PositionCenter:
            default:
                abort();
                break;
            }
        };

        // first resize (without checking constrains), then snap, then check bounds, then check constrains
        calculateMoveResizeGeom();
        // adjust new size to snap to other windows/borders
        setMoveResizeGeometry(workspace()->adjustClientSize(this, moveResizeGeometry(), mode));

        if (!isUnrestrictedMoveResize()) {
            // Make sure the titlebar isn't behind a restricted area. We don't need to restrict
            // the other directions. If not visible enough, move the window to the closest valid
            // point. We bruteforce this by slowly moving the window back to its previous position
            QRegion availableArea(workspace()->clientArea(FullArea, -1, 0));   // On the screen
            availableArea -= workspace()->restrictedMoveArea(desktop());   // Strut areas
            bool transposed = false;
            int requiredPixels;
            QRect bTitleRect = titleBarRect(transposed, requiredPixels);
            int lastVisiblePixels = -1;
            QRect lastTry = moveResizeGeometry();
            bool titleFailed = false;
            for (;;) {
                const QRect titleRect(bTitleRect.translated(moveResizeGeometry().topLeft()));
                int visiblePixels = 0;
                int realVisiblePixels = 0;
                for (const QRect &rect : availableArea) {
                    const QRect r = rect & titleRect;
                    realVisiblePixels += r.width() * r.height();
                    if ((transposed && r.width() == titleRect.width()) || // Only the full size regions...
                        (!transposed && r.height() == titleRect.height())) // ...prevents long slim areas
                        visiblePixels += r.width() * r.height();
                }

                if (visiblePixels >= requiredPixels)
                    break; // We have reached a valid position

                if (realVisiblePixels <= lastVisiblePixels) {
                    if (titleFailed && realVisiblePixels < lastVisiblePixels)
                        break; // we won't become better
                    else {
                        if (!titleFailed)
                            setMoveResizeGeometry(lastTry);
                        titleFailed = true;
                    }
                }
                lastVisiblePixels = realVisiblePixels;
                QRect moveResizeGeom = moveResizeGeometry();
                lastTry = moveResizeGeom;

                // Not visible enough, move the window to the closest valid point. We bruteforce
                // this by slowly moving the window back to its previous position.
                // The geometry changes at up to two edges, the one with the title (if) shall take
                // precedence. The opposing edge has no impact on visiblePixels and only one of
                // the adjacent can alter at a time, ie. it's enough to ignore adjacent edges
                // if the title edge altered
                bool leftChanged  = previousMoveResizeGeom.left()   != moveResizeGeom.left();
                bool rightChanged = previousMoveResizeGeom.right()  != moveResizeGeom.right();
                bool topChanged   = previousMoveResizeGeom.top()    != moveResizeGeom.top();
                bool btmChanged   = previousMoveResizeGeom.bottom() != moveResizeGeom.bottom();
                auto fixChangedState = [titleFailed](bool &major, bool &counter, bool &ad1, bool &ad2) {
                    counter = false;
                    if (titleFailed)
                        major = false;
                    if (major)
                        ad1 = ad2 = false;
                };
                switch (titlebarPosition()) {
                default:
                case PositionTop:
                    fixChangedState(topChanged, btmChanged, leftChanged, rightChanged);
                    break;
                case PositionLeft:
                    fixChangedState(leftChanged, rightChanged, topChanged, btmChanged);
                    break;
                case PositionBottom:
                    fixChangedState(btmChanged, topChanged, leftChanged, rightChanged);
                    break;
                case PositionRight:
                    fixChangedState(rightChanged, leftChanged, topChanged, btmChanged);
                    break;
                }
                if (topChanged)
                    moveResizeGeom.setTop(moveResizeGeom.y() + sign(previousMoveResizeGeom.y() - moveResizeGeom.y()));
                else if (leftChanged)
                    moveResizeGeom.setLeft(moveResizeGeom.x() + sign(previousMoveResizeGeom.x() - moveResizeGeom.x()));
                else if (btmChanged)
                    moveResizeGeom.setBottom(moveResizeGeom.bottom() + sign(previousMoveResizeGeom.bottom() - moveResizeGeom.bottom()));
                else if (rightChanged)
                    moveResizeGeom.setRight(moveResizeGeom.right() + sign(previousMoveResizeGeom.right() - moveResizeGeom.right()));
                else
                    break; // no position changed - that's certainly not good
                setMoveResizeGeometry(moveResizeGeom);
            }
        }

        // Always obey size hints, even when in "unrestricted" mode
        QSize size = adjustedSize(moveResizeGeometry().size(), sizemode);
        // the new topleft and bottomright corners (after checking size constrains), if they'll be needed
        topleft = QPoint(moveResizeGeometry().right() - size.width() + 1, moveResizeGeometry().bottom() - size.height() + 1);
        bottomright = QPoint(moveResizeGeometry().left() + size.width() - 1, moveResizeGeometry().top() + size.height() - 1);
        orig = moveResizeGeometry();

        // if aspect ratios are specified, both dimensions may change.
        // Therefore grow to the right/bottom if needed.
        // TODO it should probably obey gravity rather than always using right/bottom ?
        if (sizemode == SizemodeFixedH)
            orig.setRight(bottomright.x());
        else if (sizemode == SizemodeFixedW)
            orig.setBottom(bottomright.y());

        calculateMoveResizeGeom();

        if (moveResizeGeometry().size() != previousMoveResizeGeom.size())
            update = true;
    } else if (isMove()) {
        Q_ASSERT(mode == PositionCenter);
        if (!isMovable()) { // isMovableAcrossScreens() must have been true to get here
            // Special moving of maximized windows on Xinerama screens
            int screen = screens()->number(globalPos);
            if (isFullScreen())
                setMoveResizeGeometry(workspace()->clientArea(FullScreenArea, screen, 0));
            else {
                QRect moveResizeGeom = workspace()->clientArea(MaximizeArea, screen, 0);
                QSize adjSize = adjustedSize(moveResizeGeom.size(), SizemodeMax);
                if (adjSize != moveResizeGeom.size()) {
                    QRect r(moveResizeGeom);
                    moveResizeGeom.setSize(adjSize);
                    moveResizeGeom.moveCenter(r.center());
                }
                setMoveResizeGeometry(moveResizeGeom);
            }
        } else {
            // first move, then snap, then check bounds
            QRect moveResizeGeom = moveResizeGeometry();
            moveResizeGeom.moveTopLeft(topleft);
            moveResizeGeom.moveTopLeft(workspace()->adjustClientPosition(this, moveResizeGeom.topLeft(),
                                       isUnrestrictedMoveResize()));
            setMoveResizeGeometry(moveResizeGeom);

            if (!isUnrestrictedMoveResize()) {
                const QRegion strut = workspace()->restrictedMoveArea(desktop());   // Strut areas
                QRegion availableArea(workspace()->clientArea(FullArea, -1, 0));   // On the screen
                availableArea -= strut;   // Strut areas
                bool transposed = false;
                int requiredPixels;
                QRect bTitleRect = titleBarRect(transposed, requiredPixels);
                for (;;) {
                    QRect moveResizeGeom = moveResizeGeometry();
                    const QRect titleRect(bTitleRect.translated(moveResizeGeom.topLeft()));
                    int visiblePixels = 0;
                    for (const QRect &rect : availableArea) {
                        const QRect r = rect & titleRect;
                        if ((transposed && r.width() == titleRect.width()) || // Only the full size regions...
                            (!transposed && r.height() == titleRect.height())) // ...prevents long slim areas
                            visiblePixels += r.width() * r.height();
                    }
                    if (visiblePixels >= requiredPixels)
                        break; // We have reached a valid position

                    // (esp.) if there're more screens with different struts (panels) it the titlebar
                    // will be movable outside the movearea (covering one of the panels) until it
                    // crosses the panel "too much" (not enough visiblePixels) and then stucks because
                    // it's usually only pushed by 1px to either direction
                    // so we first check whether we intersect suc strut and move the window below it
                    // immediately (it's still possible to hit the visiblePixels >= titlebarArea break
                    // by moving the window slightly downwards, but it won't stuck)
                    // see bug #274466
                    // and bug #301805 for why we can't just match the titlearea against the screen
                    if (screens()->count() > 1) { // optimization
                        // TODO: could be useful on partial screen struts (half-width panels etc.)
                        int newTitleTop = -1;
                        for (const QRect &r : strut) {
                            if (r.top() == 0 && r.width() > r.height() && // "top panel"
                                r.intersects(moveResizeGeom) && moveResizeGeom.top() < r.bottom()) {
                                newTitleTop = r.bottom() + 1;
                                break;
                            }
                        }
                        if (newTitleTop > -1) {
                            moveResizeGeom.moveTop(newTitleTop); // invalid position, possibly on screen change
                            setMoveResizeGeometry(moveResizeGeom);
                            break;
                        }
                    }

                    int dx = sign(previousMoveResizeGeom.x() - moveResizeGeom.x()),
                        dy = sign(previousMoveResizeGeom.y() - moveResizeGeom.y());
                    if (visiblePixels && dx) // means there's no full width cap -> favor horizontally
                        dy = 0;
                    else if (dy)
                        dx = 0;

                    // Move it back
                    moveResizeGeom.translate(dx, dy);
                    setMoveResizeGeometry(moveResizeGeom);

                    if (moveResizeGeom == previousMoveResizeGeom) {
                        break; // Prevent lockup
                    }
                }
            }
        }
        if (moveResizeGeometry().topLeft() != previousMoveResizeGeom.topLeft())
            update = true;
    } else
        abort();

    if (!update)
        return;

    if (isResize() && !haveResizeEffect()) {
        doResizeSync();
    } else
        performMoveResize();

    if (isMove()) {
        ScreenEdges::self()->check(globalPos, QDateTime::fromMSecsSinceEpoch(xTime()));
    }
}

void X11Client::doResizeSync()
{
    if (!syncRequest.timeout) {
        syncRequest.timeout = new QTimer(this);
        connect(syncRequest.timeout, &QTimer::timeout, this, &X11Client::performMoveResize);
        syncRequest.timeout->setSingleShot(true);
    }
    if (syncRequest.counter != XCB_NONE) {
        syncRequest.timeout->start(250);
        sendSyncRequest();
    } else {                            // for clients not supporting the XSYNC protocol, we
        syncRequest.isPending = true;   // limit the resizes to 30Hz to take pointless load from X11
        syncRequest.timeout->start(33); // and the client, the mouse is still moved at full speed
    }                                   // and no human can control faster resizes anyway
    const QRect &moveResizeGeom = moveResizeGeometry();
    m_client.setGeometry(0, 0, moveResizeGeom.width() - (borderLeft() + borderRight()), moveResizeGeom.height() - (borderTop() + borderBottom()));
}

void AbstractClient::performMoveResize()
{
    const QRect &moveResizeGeom = moveResizeGeometry();
    if (isMove() || (isResize() && !haveResizeEffect())) {
        setFrameGeometry(moveResizeGeom);
    }
    doPerformMoveResize();
    if (isResize())
        addRepaintFull();
    positionGeometryTip();
    emit clientStepUserMovedResized(this, moveResizeGeom);
}

void X11Client::doPerformMoveResize()
{
    if (syncRequest.counter == XCB_NONE)   // client w/o XSYNC support. allow the next resize event
        syncRequest.isPending = false; // NEVER do this for clients with a valid counter
                                       // (leads to sync request races in some clients)
}

void AbstractClient::setElectricBorderMode(QuickTileMode mode)
{
    if (mode != QuickTileMode(QuickTileFlag::Maximize)) {
        // sanitize the mode, ie. simplify "invalid" combinations
        if ((mode & QuickTileFlag::Horizontal) == QuickTileMode(QuickTileFlag::Horizontal))
            mode &= ~QuickTileMode(QuickTileFlag::Horizontal);
        if ((mode & QuickTileFlag::Vertical) == QuickTileMode(QuickTileFlag::Vertical))
            mode &= ~QuickTileMode(QuickTileFlag::Vertical);
    }
    m_electricMode = mode;
}

void AbstractClient::setElectricBorderMaximizing(bool maximizing)
{
    m_electricMaximizing = maximizing;
    if (maximizing)
        outline()->show(electricBorderMaximizeGeometry(Cursor::pos(), desktop()), moveResizeGeometry());
    else
        outline()->hide();
    elevate(maximizing);
}

QRect AbstractClient::electricBorderMaximizeGeometry(QPoint pos, int desktop)
{
    if (electricBorderMode() == QuickTileMode(QuickTileFlag::Maximize)) {
        if (maximizeMode() == MaximizeFull)
            return geometryRestore();
        else
            return workspace()->clientArea(MaximizeArea, pos, desktop);
    }

    QRect ret = workspace()->clientArea(MaximizeArea, pos, desktop);
    if (electricBorderMode() & QuickTileFlag::Left)
        ret.setRight(ret.left()+ret.width()/2 - 1);
    else if (electricBorderMode() & QuickTileFlag::Right)
        ret.setLeft(ret.right()-(ret.width()-ret.width()/2) + 1);
    if (electricBorderMode() & QuickTileFlag::Top)
        ret.setBottom(ret.top()+ret.height()/2 - 1);
    else if (electricBorderMode() & QuickTileFlag::Bottom)
        ret.setTop(ret.bottom()-(ret.height()-ret.height()/2) + 1);

    return ret;
}

void AbstractClient::setQuickTileMode(QuickTileMode mode, bool keyboard)
{
    // Only allow quick tile on a regular window.
    if (!isResizable()) {
        return;
    }

    workspace()->updateFocusMousePosition(Cursor::pos()); // may cause leave event

    GeometryUpdatesBlocker blocker(this);

    if (mode == QuickTileMode(QuickTileFlag::Maximize)) {
        m_quickTileMode = int(QuickTileFlag::None);
        if (maximizeMode() == MaximizeFull) {
            setMaximize(false, false);
        } else {
            QRect prev_geom_restore = geometryRestore(); // setMaximize() would set moveResizeGeom as geom_restore
            m_quickTileMode = int(QuickTileFlag::Maximize);
            setMaximize(true, true);
            QRect clientArea = workspace()->clientArea(MaximizeArea, this);
            if (frameGeometry().top() != clientArea.top()) {
                QRect r(frameGeometry());
                r.moveTop(clientArea.top());
                setFrameGeometry(r);
            }
            setGeometryRestore(prev_geom_restore);
        }
        emit quickTileModeChanged();
        return;
    }

    // sanitize the mode, ie. simplify "invalid" combinations
    if ((mode & QuickTileFlag::Horizontal) == QuickTileMode(QuickTileFlag::Horizontal))
        mode &= ~QuickTileMode(QuickTileFlag::Horizontal);
    if ((mode & QuickTileFlag::Vertical) == QuickTileMode(QuickTileFlag::Vertical))
        mode &= ~QuickTileMode(QuickTileFlag::Vertical);

    setElectricBorderMode(mode); // used by ::electricBorderMaximizeGeometry(.)

    // restore from maximized so that it is possible to tile maximized windows with one hit or by dragging
    if (maximizeMode() != MaximizeRestore) {

        if (mode != QuickTileMode(QuickTileFlag::None)) {
            // decorations may turn off some borders when tiled
            const ForceGeometry_t geom_mode = isDecorated() ? ForceGeometrySet : NormalGeometrySet;
            m_quickTileMode = int(QuickTileFlag::None); // Temporary, so the maximize code doesn't get all confused

            setMaximize(false, false);

            setFrameGeometry(electricBorderMaximizeGeometry(keyboard ? frameGeometry().center() : Cursor::pos(), desktop()), geom_mode);
            // Store the mode change
            m_quickTileMode = mode;
        } else {
            m_quickTileMode = mode;
            setMaximize(false, false);
        }

        emit quickTileModeChanged();

        return;
    }

    if (mode != QuickTileMode(QuickTileFlag::None)) {
        QPoint whichScreen = keyboard ? frameGeometry().center() : Cursor::pos();

        // If trying to tile to the side that the window is already tiled to move the window to the next
        // screen if it exists, otherwise toggle the mode (set QuickTileFlag::None)
        if (quickTileMode() == mode) {
            const int numScreens = screens()->count();
            const int curScreen = screen();
            int nextScreen = curScreen;
            QVarLengthArray<QRect> screens(numScreens);
            for (int i = 0; i < numScreens; ++i)   // Cache
                screens[i] = Screens::self()->geometry(i);
            for (int i = 0; i < numScreens; ++i) {

                if (i == curScreen)
                    continue;

                if (screens[i].bottom() <= screens[curScreen].top() || screens[i].top() >= screens[curScreen].bottom())
                    continue; // not in horizontal line

                const int x = screens[i].center().x();
                if ((mode & QuickTileFlag::Horizontal) == QuickTileMode(QuickTileFlag::Left)) {
                    if (x >= screens[curScreen].center().x() || (curScreen != nextScreen && x <= screens[nextScreen].center().x()))
                        continue; // not left of current or more left then found next
                } else if ((mode & QuickTileFlag::Horizontal) == QuickTileMode(QuickTileFlag::Right)) {
                    if (x <= screens[curScreen].center().x() || (curScreen != nextScreen && x >= screens[nextScreen].center().x()))
                        continue; // not right of current or more right then found next
                }

                nextScreen = i;
            }

            if (nextScreen == curScreen) {
                mode = QuickTileFlag::None; // No other screens, toggle tiling
            } else {
                // Move to other screen
                setFrameGeometry(geometryRestore().translated(screens[nextScreen].topLeft() - screens[curScreen].topLeft()));
                whichScreen = screens[nextScreen].center();

                // Swap sides
                if (mode & QuickTileFlag::Horizontal) {
                    mode = (~mode & QuickTileFlag::Horizontal) | (mode & QuickTileFlag::Vertical);
                }
            }
            setElectricBorderMode(mode); // used by ::electricBorderMaximizeGeometry(.)
        } else if (quickTileMode() == QuickTileMode(QuickTileFlag::None)) {
            // Not coming out of an existing tile, not shifting monitors, we're setting a brand new tile.
            // Store geometry first, so we can go out of this tile later.
            setGeometryRestore(frameGeometry());
        }

        if (mode != QuickTileMode(QuickTileFlag::None)) {
            m_quickTileMode = mode;
            // decorations may turn off some borders when tiled
            const ForceGeometry_t geom_mode = isDecorated() ? ForceGeometrySet : NormalGeometrySet;
            // Temporary, so the maximize code doesn't get all confused
            m_quickTileMode = int(QuickTileFlag::None);
            setFrameGeometry(electricBorderMaximizeGeometry(whichScreen, desktop()), geom_mode);
        }

        // Store the mode change
        m_quickTileMode = mode;
    }

    if (mode == QuickTileMode(QuickTileFlag::None)) {
        m_quickTileMode = int(QuickTileFlag::None);
        // Untiling, so just restore geometry, and we're done.
        if (!geometryRestore().isValid()) // invalid if we started maximized and wait for placement
            setGeometryRestore(frameGeometry());
        // decorations may turn off some borders when tiled
        const ForceGeometry_t geom_mode = isDecorated() ? ForceGeometrySet : NormalGeometrySet;
        setFrameGeometry(geometryRestore(), geom_mode);
        checkWorkspacePosition(); // Just in case it's a different screen
    }
    emit quickTileModeChanged();
}

void AbstractClient::sendToScreen(int newScreen)
{
    newScreen = rules()->checkScreen(newScreen);
    if (isActive()) {
        screens()->setCurrent(newScreen);
        // might impact the layer of a fullscreen window
        foreach (AbstractClient *cc, workspace()->allClientList()) {
            if (cc->isFullScreen() && cc->screen() == newScreen) {
                cc->updateLayer();
            }
        }
    }
    if (screen() == newScreen)   // Don't use isOnScreen(), that's true even when only partially
        return;

    GeometryUpdatesBlocker blocker(this);

    // operating on the maximized / quicktiled window would leave the old geom_restore behind,
    // so we clear the state first
    MaximizeMode maxMode = maximizeMode();
    QuickTileMode qtMode = quickTileMode();
    if (maxMode != MaximizeRestore)
        maximize(MaximizeRestore);
    if (qtMode != QuickTileMode(QuickTileFlag::None))
        setQuickTileMode(QuickTileFlag::None, true);

    QRect oldScreenArea = workspace()->clientArea(MaximizeArea, this);
    QRect screenArea = workspace()->clientArea(MaximizeArea, newScreen, desktop());

    // the window can have its center so that the position correction moves the new center onto
    // the old screen, what will tile it where it is. Ie. the screen is not changed
    // this happens esp. with electric border quicktiling
    if (qtMode != QuickTileMode(QuickTileFlag::None))
        keepInArea(oldScreenArea);

    QRect oldGeom = frameGeometry();
    QRect newGeom = oldGeom;
    // move the window to have the same relative position to the center of the screen
    // (i.e. one near the middle of the right edge will also end up near the middle of the right edge)
    QPoint center = newGeom.center() - oldScreenArea.center();
    center.setX(center.x() * screenArea.width() / oldScreenArea.width());
    center.setY(center.y() * screenArea.height() / oldScreenArea.height());
    center += screenArea.center();
    newGeom.moveCenter(center);
    setFrameGeometry(newGeom);

    // If the window was inside the old screen area, explicitly make sure its inside also the new screen area.
    // Calling checkWorkspacePosition() should ensure that, but when moving to a small screen the window could
    // be big enough to overlap outside of the new screen area, making struts from other screens come into effect,
    // which could alter the resulting geometry.
    if (oldScreenArea.contains(oldGeom)) {
        keepInArea(screenArea);
    }

    // align geom_restore - checkWorkspacePosition operates on it
    setGeometryRestore(frameGeometry());

    checkWorkspacePosition(oldGeom);

    // re-align geom_restore to constrained geometry
    setGeometryRestore(frameGeometry());

    // finally reset special states
    // NOTICE that MaximizeRestore/QuickTileFlag::None checks are required.
    // eg. setting QuickTileFlag::None would break maximization
    if (maxMode != MaximizeRestore)
        maximize(maxMode);
    if (qtMode != QuickTileMode(QuickTileFlag::None) && qtMode != quickTileMode())
        setQuickTileMode(qtMode, true);

    auto tso = workspace()->ensureStackingOrder(transients());
    for (auto it = tso.constBegin(), end = tso.constEnd(); it != end; ++it)
        (*it)->sendToScreen(newScreen);
}

} // namespace