Ensure that QBackingStore::flush() is not used across window hierarchies

Change-Id: I0713d7499f32819db4263e36dff58812a9ac763c Reviewed-by: Laszlo Agocs <[email protected]>
RDevCore · Oct 6, 2016 · 7a7b745 · 7a7b745
1 parent 669add9
commit 7a7b745
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/gui/painting/qbackingstore.cpp b/src/gui/painting/qbackingstore.cpp
@@ -112,6 +112,8 @@ void QBackingStore::flush(const QRegion &region, QWindow *win, const QPoint &off
     }
 #endif
 
+    Q_ASSERT(win == this->window() || this->window()->isAncestorOf(win, QWindow::ExcludeTransients));
+
     d_ptr->platformBackingStore->flush(win, QHighDpi::toNativeLocalRegion(region, win),
                                             QHighDpi::toNativeLocalPosition(offset, win));
 }