QDesktopWidget::resized wasn't emitted properly on X11.

When the size of one of the screen changes but the geometry of the
whole desktop hasn't been changed the resized() signal wasn't emitted.
The patch by Lubos Lunak also adds emitting of a signal whenever the
screen is turned on or off.

Task-number: 226048
Reviewed-by: Brad

1 files changed, 15 insertions, 6 deletions

diff --git a/src/gui/kernel/qapplication_x11.cpp b/src/gui/kernel/qapplication_x11.cpp
index 1df442f..6babda9 100644
--- a/src/gui/kernel/qapplication_x11.cpp
+++ b/src/gui/kernel/qapplication_x11.cpp
@@ -3351,15 +3351,24 @@ int QApplication::x11ProcessEvent(XEvent* event)
 
         // update the size for desktop widget
         int scr = X11->ptrXRRRootToScreen(X11->display, event->xany.window);
-        QWidget *w = desktop()->screen(scr);
+        QDesktopWidget *desktop = QApplication::desktop();
+        QWidget *w = desktop->screen(scr);
         QSize oldSize(w->size());
         w->data->crect.setWidth(DisplayWidth(X11->display, scr));
         w->data->crect.setHeight(DisplayHeight(X11->display, scr));
-        if (w->size() != oldSize) {
-            QResizeEvent e(w->size(), oldSize);
-            QApplication::sendEvent(w, &e);
-            emit desktop()->resized(scr);
-        }
+        QVarLengthArray<QRect> oldSizes(desktop->numScreens());
+        for (int i = 0; i < desktop->numScreens(); ++i)
+            oldSizes[i] = desktop->screenGeometry(i);
+        QResizeEvent e(w->size(), oldSize);
+        QApplication::sendEvent(w, &e);
+        for (int i = 0; i < qMin(oldSizes.count(), desktop->numScreens()); ++i) {
+            if (oldSizes[i] != desktop->screenGeometry(i))
+                emit desktop->resized(i);
+        }
+        for (int i = oldSizes.count(); i < desktop->numScreens(); ++i)
+            emit desktop->resized(i); // added
+        for (int i = desktop->numScreens(); i < oldSizes.count(); ++i)
+            emit desktop->resized(i); // removed
     }
 #endif // QT_NO_XRANDR