fix untabbing position

the geometry setting needs to happen out of recursion,
has to be smarter for unmaximizing and also no real
place in TabGroup - the client is no longer tabbed thus
it's not the groups task to manage it's geometry.

BUG: 226881
REVIEW: 106182
FIXED-IN: 4.9.1

client.cpp

@@ -1940,11 +1940,35 @@ bool Client::tabTo(Client *other, bool behind, bool activate)
 bool Client::untab(const QRect &toGeometry)
 {
     TabGroup *group = tab_group;
-    if (group && group->remove(this, toGeometry)) { // remove sets the tabgroup to "0", therefore the pointer is cached
+    if (group && group->remove(this)) { // remove sets the tabgroup to "0", therefore the pointer is cached
         if (group->isEmpty()) {
             delete group;
         }
         setClientShown(!(isMinimized() || isShade()));
+        bool keepSize = toGeometry.size() == size();
+        bool changedSize = false;
+        if (quickTileMode() != QuickTileNone) {
+            changedSize = true;
+            setQuickTileMode(QuickTileNone); // if we leave a quicktiled group, assume that the user wants to untile
+        }
+        if (toGeometry.isValid()) {
+            if (maximizeMode() != Client::MaximizeRestore) {
+                changedSize = true;
+                maximize(Client::MaximizeRestore); // explicitly calling for a geometry -> unmaximize
+            }
+            if (keepSize && changedSize) {
+                geom_restore = geometry(); // checkWorkspacePosition() invokes it
+                QPoint cpoint = QCursor::pos();
+                QPoint point = cpoint;
+                point.setX((point.x() - toGeometry.x()) * geom_restore.width() / toGeometry.width());
+                point.setY((point.y() - toGeometry.y()) * geom_restore.height() / toGeometry.height());
+                geom_restore.moveTo(cpoint-point);
+            } else {
+                geom_restore = toGeometry; // checkWorkspacePosition() invokes it
+            }
+            setGeometry(geom_restore);
+            checkWorkspacePosition();
+        }
         return true;
     }
     return false;

placement.cpp

@@ -319,6 +319,12 @@ void Placement::reinitCascading(int desktop)
     }
 }
 
+QPoint Workspace::cascadeOffset(const Client *c) const
+{
+    QRect area = clientArea(PlacementArea, c->geometry().center(), c->desktop());
+    return QPoint(area.width()/48, area.height()/48);
+}
+
 /*!
   Place windows in a cascading order, remembering positions for each desktop
 */
@@ -330,8 +336,7 @@ void Placement::placeCascaded(Client* c, QRect& area, Policy nextPlacement)
     int xp, yp;
 
     //CT how do I get from the 'Client' class the size that NW squarish "handle"
-    const int delta_x = 24;
-    const int delta_y = 24;
+    const QPoint delta = m_WorkspacePtr->cascadeOffset(c);
 
     const int dn = c->desktop() == 0 || c->isOnAllDesktops() ? (m_WorkspacePtr->currentDesktop() - 1) : (c->desktop() - 1);
 
@@ -375,16 +380,16 @@ void Placement::placeCascaded(Client* c, QRect& area, Policy nextPlacement)
          * egcs-2.91.66 on SuSE Linux 6.3. The equivalent forms compile fine.
          * 22-Dec-1999 CS
          *
-         * if (xp != X && yp == Y) xp = delta_x * (++(cci[dn].col));
-         * if (yp != Y && xp == X) yp = delta_y * (++(cci[dn].row));
+         * if (xp != X && yp == Y) xp = delta.x() * (++(cci[dn].col));
+         * if (yp != Y && xp == X) yp = delta.y() * (++(cci[dn].row));
          */
         if (xp != X && yp == Y) {
             ++(cci[dn].col);
-            xp = delta_x * cci[dn].col;
+            xp = delta.x() * cci[dn].col;
         }
         if (yp != Y && xp == X) {
             ++(cci[dn].row);
-            yp = delta_y * cci[dn].row;
+            yp = delta.y() * cci[dn].row;
         }
 
         // last resort: if still doesn't fit, smart place it
@@ -398,7 +403,7 @@ void Placement::placeCascaded(Client* c, QRect& area, Policy nextPlacement)
     c->move(QPoint(xp, yp));
 
     // new position
-    cci[dn].pos = QPoint(xp + delta_x, yp + delta_y);
+    cci[dn].pos = QPoint(xp + delta.x(), yp + delta.y());
 }
 
 /*!

tabgroup.cpp

@@ -144,7 +144,7 @@ bool TabGroup::add(Client* c, Client *other, bool after, bool becomeVisible)
     return true;
 }
 
-bool TabGroup::remove(Client* c, const QRect& newGeom)
+bool TabGroup::remove(Client* c)
 {
     if (!c)
         return false;
@@ -159,7 +159,7 @@ bool TabGroup::remove(Client* c, const QRect& newGeom)
     updateMinMaxSize();
 
     if (m_clients.count() == 1) { // split
-        remove(m_clients.at(0), m_clients.at(0)->geometry());
+        remove(m_clients.at(0));
     }
     if (m_clients.isEmpty()) { // remaining singleton "tab"
         c->setClientShown(true);
@@ -174,14 +174,6 @@ bool TabGroup::remove(Client* c, const QRect& newGeom)
             static_cast<EffectsHandlerImpl*>(effects)->slotCurrentTabAboutToChange(c->effectWindow(), m_current->effectWindow());
     }
 
-    if (c->quickTileMode() != QuickTileNone)
-        c->setQuickTileMode(QuickTileNone); // if we leave a quicktiled group, assume that the user wants to untile
-    else if (newGeom.isValid()) {
-        c->maximize(Client::MaximizeRestore); // explicitly calling for a geometry -> unmaximize - in doubt
-        c->setGeometry(newGeom);
-        c->checkWorkspacePosition(); // oxygen has now twice kicked me a window out of the screen - better be safe then sorry
-    }
-
     // Notify effects of removal
     if (effects)
         static_cast<EffectsHandlerImpl*>(effects)->slotTabRemoved(c->effectWindow(), m_current->effectWindow());

tabgroup.h

@@ -157,7 +157,7 @@ private:
     void move(KWin::Client* c, KWin::Client* before, bool behind);
 
 //     friend bool Client::untab(const QRect&);
-    bool remove(KWin::Client *c, const QRect &newGeom = QRect());
+    bool remove(KWin::Client *c);
 
     ClientList m_clients;
     Client *m_current;

useractions.cpp

@@ -766,8 +766,7 @@ void Workspace::performWindowOperation(Client* c, Options::WindowOperation op)
     case Options::NoOp:
         break;
     case Options::RemoveTabFromGroupOp:
-        if (c->untab())
-        if (options->focusPolicyIsReasonable())
+        if (c->untab(c->geometry().translated(cascadeOffset(c))) && options->focusPolicyIsReasonable())
              takeActivity(c, ActivityFocus | ActivityRaise, true);
         break;
     case Options::ActivateNextTabOp:
@@ -1424,7 +1423,7 @@ void Workspace::slotActivatePrevTab()
 void Workspace::slotUntab()
 {
     if (active_client)
-        active_client->untab();
+        active_client->untab(active_client->geometry().translated(cascadeOffset(active_client)));
 }
 
 /*!

workspace.h

@@ -301,6 +301,8 @@ public:
      */
     int desktopToLeft(int id = 0, bool wrap = true) const;
 
+    QPoint cascadeOffset(const Client *c) const;
+
 private:
     int desktopCount_;
     QSize desktopGridSize_;