Changes: Fix a crash situation in ApplicationLayoutDirectionChange propagation loop.

RevBy: Jörgen, Stanislav

Details: If an scene item is destroyed (deleted) from scene on layout direction change,
then the application would crash as the iterator would become invalid.
The fix makes a snapshot of current scene elements and starts to propagate the event,
veryfing that each item still exists in scene.

1 files changed, 3 insertions, 2 deletions

diff --git a/src/corelib/widgets/mwindow.cpp b/src/corelib/widgets/mwindow.cpp
index 05397b75..1bc3fe3a 100644
--- a/src/corelib/widgets/mwindow.cpp
+++ b/src/corelib/widgets/mwindow.cpp
@@ -968,8 +968,9 @@ bool MWindow::event(QEvent *event)
             QList<QGraphicsItem *> items = scene()->items();
 
             // call setLayoutDirection_helper() for all top-level items
-            foreach(QGraphicsItem * item, items) {
-                if (!item->parentItem()) {
+            for (int i = 0; i < items.size(); i++) {
+                QGraphicsItem *item = items.at(i);
+                if (scene()->items().contains(item) && !item->parentItem()) {
                     d->handleApplicationLayoutDirectionChangeEvent(item);
                 }
             }