Avoid a crash in QDockAreaLayoutInfo::apply caused by layout info recursively replaced
while the method is still working on it.
---
diff --git a/src/widgets/widgets/qmainwindowlayout.cpp b/src/widgets/widgets/qmainwindowlayout.cpp
index fc0bb07e..17c5e0f0 100644
--- a/src/widgets/widgets/qmainwindowlayout.cpp
+++ b/src/widgets/widgets/qmainwindowlayout.cpp
@@ -2019,6 +2019,10 @@ void QMainWindowLayout::setGeometry(const QRect &_r)
     if (savedState.isValid())
         return;
 
+    if (restoredState && isInApplyState)
+        // avoid to replace the state again that is currently used in applyState
+        return;
+
     QRect r = _r;
 
     QLayout::setGeometry(r);