2 files changed, 13 insertions, 0 deletions
diff --git a/src/gui/kernel/qplatformwindow.cpp b/src/gui/kernel/qplatformwindow.cpp
index bc1aeb8217..9fe68bd564 100644
--- a/src/gui/kernel/qplatformwindow.cpp
+++ b/src/gui/kernel/qplatformwindow.cpp
@@ -749,6 +749,16 @@ void QPlatformWindow::requestUpdate()
 }
 
 /*!
+    Returns true if the window has a pending update request.
+
+    \sa requestUpdate(), deliverUpdateRequest()
+*/
+bool QPlatformWindow::hasPendingUpdateRequest() const
+{
+    return qt_window_private(window())->updateRequestPending;
+}
+
+/*!
     Delivers an QEvent::UpdateRequest event to the window.
 
     QPlatformWindow subclasses can re-implement this function to
@@ -757,6 +767,8 @@ void QPlatformWindow::requestUpdate()
 */
 void QPlatformWindow::deliverUpdateRequest()
 {
+    Q_ASSERT(hasPendingUpdateRequest());
+
     QWindow *w = window();
     QWindowPrivate *wp = qt_window_private(w);
     wp->updateRequestPending = false;
diff --git a/src/gui/kernel/qplatformwindow.h b/src/gui/kernel/qplatformwindow.h
index 2fe8ad94e6..2b353959c7 100644
--- a/src/gui/kernel/qplatformwindow.h
+++ b/src/gui/kernel/qplatformwindow.h
@@ -144,6 +144,7 @@ public:
         const QRect &initialGeometry, int defaultWidth, int defaultHeight);
 
     virtual void requestUpdate();
+    bool hasPendingUpdateRequest() const;
     virtual void deliverUpdateRequest();
 
     // Window property accessors. Platform plugins should use these