1 files changed, 3 insertions, 9 deletions
diff --git a/src/widgets/kernel/qwidgetbackingstore.cpp b/src/widgets/kernel/qwidgetbackingstore.cpp
index 0481dffda8..ab33649b3e 100644
--- a/src/widgets/kernel/qwidgetbackingstore.cpp
+++ b/src/widgets/kernel/qwidgetbackingstore.cpp
@@ -310,12 +310,6 @@ bool QWidgetBackingStore::bltRect(const QRect &rect, int dx, int dy, QWidget *wi
     return store->scroll(tlwRect, dx, dy);
 }
 
-void QWidgetBackingStore::releaseBuffer()
-{
-    if (store)
-        store->resize(QSize());
-}
-
 /*!
     Prepares the window surface to paint a\ toClean region of the \a widget and
     updates the BeginPaintInfo struct accordingly.
@@ -497,11 +491,11 @@ void QWidgetBackingStore::sendUpdateRequest(QWidget *widget, UpdateTime updateTi
     switch (updateTime) {
     case UpdateLater:
         updateRequestSent = true;
-        QApplication::postEvent(widget, new QEvent(QEvent::UpdateRequest), Qt::LowEventPriority);
+        QCoreApplication::postEvent(widget, new QEvent(QEvent::UpdateRequest), Qt::LowEventPriority);
         break;
     case UpdateNow: {
         QEvent event(QEvent::UpdateRequest);
-        QApplication::sendEvent(widget, &event);
+        QCoreApplication::sendEvent(widget, &event);
         break;
         }
     }
@@ -1513,7 +1507,7 @@ void QWidgetPrivate::invalidateBackingStore(const T &r)
     if (r.isEmpty())
         return;
 
-    if (QApplication::closingDown())
+    if (QCoreApplication::closingDown())
         return;
 
     Q_Q(QWidget);