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-rw-r--r--src/gui/kernel/qwindow.cpp3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/gui/kernel/qwindow.cpp b/src/gui/kernel/qwindow.cpp
index 5f71bdaded..18e8bcf99c 100644
--- a/src/gui/kernel/qwindow.cpp
+++ b/src/gui/kernel/qwindow.cpp
@@ -2195,6 +2195,9 @@ void QWindowPrivate::deliverUpdateRequest()
*/
void QWindow::requestUpdate()
{
+ Q_ASSERT_X(QThread::currentThread() == QCoreApplication::instance()->thread(),
+ "QWindow", "Updates can only be scheduled from the GUI (main) thread");
+
Q_D(QWindow);
if (d->updateRequestPending || !d->platformWindow)
return;