Adapt to window management changes

Our wayland interface lifespan only needs to live as long as the window
is mapped.

Given this corresponds directly to the lifespan of AbstractClient we can
just set a parent and everything is handled implicitly.

src/abstract_client.cpp

@@ -1498,7 +1498,7 @@ void AbstractClient::setupWindowManagementInterface()
         return;
     }
     using namespace KWaylandServer;
-    auto w = waylandServer()->windowManagement()->createWindow(waylandServer()->windowManagement(), internalId());
+    auto w = waylandServer()->windowManagement()->createWindow(this, internalId());
     w->setTitle(caption());
     w->setVirtualDesktop(isOnAllDesktops() ? 0 : desktop() - 1);
     w->setActive(isActive());
@@ -1685,14 +1685,6 @@ void AbstractClient::setupWindowManagementInterface()
     m_windowManagementInterface = w;
 }
 
-void AbstractClient::destroyWindowManagementInterface()
-{
-    if (m_windowManagementInterface) {
-        m_windowManagementInterface->unmap();
-        m_windowManagementInterface = nullptr;
-    }
-}
-
 Options::MouseCommand AbstractClient::getMouseCommand(Qt::MouseButton button, bool *handled) const
 {
     *handled = false;

src/abstract_client.h

@@ -999,7 +999,6 @@ protected:
     virtual void doSetQuickTileMode();
 
     void setupWindowManagementInterface();
-    void destroyWindowManagementInterface();
     void updateColorScheme();
     void setTransientFor(AbstractClient *transientFor);
     /**

src/x11client.cpp

@@ -206,7 +206,6 @@ void X11Client::releaseWindow(bool on_shutdown)
         tabBox->nextPrev(true);
     }
 #endif
-    destroyWindowManagementInterface();
     Deleted* del = nullptr;
     if (!on_shutdown) {
         del = Deleted::create(this);
@@ -279,7 +278,6 @@ void X11Client::destroyClient()
         tabBox->nextPrev(true);
     }
 #endif
-    destroyWindowManagementInterface();
     Deleted* del = Deleted::create(this);
     if (isMoveResize())
         emit clientFinishUserMovedResized(this);

src/xdgshellclient.cpp

@@ -328,7 +328,6 @@ void XdgSurfaceClient::destroyClient()
     emit windowClosed(this, deleted);
     StackingUpdatesBlocker blocker(workspace());
     RuleBook::self()->discardUsed(this, true);
-    destroyWindowManagementInterface();
     destroyDecoration();
     cleanGrouping();
     waylandServer()->removeClient(this);