1 files changed, 13 insertions, 0 deletions
diff --git a/src/plugins/platforms/xcb/qxcbwindow.cpp b/src/plugins/platforms/xcb/qxcbwindow.cpp
index 787fdb6641..a127ac0293 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.cpp
+++ b/src/plugins/platforms/xcb/qxcbwindow.cpp
@@ -223,6 +223,7 @@ QXcbWindow::QXcbWindow(QWindow *window)
 #endif
     , m_lastWindowStateEvent(-1)
     , m_syncState(NoSyncNeeded)
+    , m_pendingSyncRequest(0)
 {
     m_screen = static_cast<QXcbScreen *>(window->screen()->handle());
 
@@ -565,6 +566,9 @@ void QXcbWindow::destroy()
     delete m_eglSurface;
     m_eglSurface = 0;
 #endif
+
+    if (m_pendingSyncRequest)
+        m_pendingSyncRequest->invalidate();
 }
 
 void QXcbWindow::setGeometry(const QRect &rect)
@@ -2371,4 +2375,13 @@ bool QXcbWindow::needsSync() const
     return m_syncState == SyncAndConfigureReceived;
 }
 
+void QXcbWindow::postSyncWindowRequest()
+{
+    if (!m_pendingSyncRequest) {
+        QXcbSyncWindowRequest *e = new QXcbSyncWindowRequest(this);
+        m_pendingSyncRequest = e;
+        QCoreApplication::postEvent(m_screen->connection(), e);
+    }
+}
+
 QT_END_NAMESPACE