1 files changed, 9 insertions, 4 deletions
diff --git a/src/widgets/kernel/qwidget.cpp b/src/widgets/kernel/qwidget.cpp
index cb7761add7..0e868091fc 100644
--- a/src/widgets/kernel/qwidget.cpp
+++ b/src/widgets/kernel/qwidget.cpp
@@ -9909,11 +9909,16 @@ void QWidget::update(const QRect &rect)
 */
 void QWidget::update(const QRegion &rgn)
 {
-    if (!isVisible() || !updatesEnabled() || rgn.isEmpty())
+    if (!isVisible() || !updatesEnabled())
+        return;
+
+    QRegion r = rgn & QWidget::rect();
+
+    if (r.isEmpty())
         return;
 
     if (testAttribute(Qt::WA_WState_InPaintEvent)) {
-        QApplication::postEvent(this, new QUpdateLaterEvent(rgn));
+        QApplication::postEvent(this, new QUpdateLaterEvent(r));
         return;
     }
 
@@ -9926,9 +9931,9 @@ void QWidget::update(const QRegion &rgn)
 #endif // Q_WS_MAC
         QTLWExtra *tlwExtra = window()->d_func()->maybeTopData();
         if (tlwExtra && !tlwExtra->inTopLevelResize && tlwExtra->backingStore)
-            tlwExtra->backingStoreTracker->markDirty(rgn, this);
+            tlwExtra->backingStoreTracker->markDirty(r, this);
     } else {
-        d_func()->repaint_sys(rgn);
+        d_func()->repaint_sys(r);
     }
 }