Fix setWindowFlags() for QMdiSubWindow.

It was impossible to hide/show the close button after a QMdiSubWindow
was created.

Task-number: QTBUG-9933
Task-number: QTBUG-27274

[ChangeLog][QtWidgets][QMdiSubWindow] Fixed setWindowFlags() for QMdiSubWindow.

Change-Id: I7db9a1bef5ba8a8ace729acb85682c8b3de9c33c
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/src/widgets/widgets/qmdisubwindow.cpp b/src/widgets/widgets/qmdisubwindow.cpp
index 8e1dcbee18..94674319bc 100644
--- a/src/widgets/widgets/qmdisubwindow.cpp
+++ b/src/widgets/widgets/qmdisubwindow.cpp
@@ -2057,13 +2057,13 @@ void QMdiSubWindowPrivate::restoreFocus()
 
 /*!
     \internal
-    ### Please add QEvent::WindowFlagsChange event
 */
 void QMdiSubWindowPrivate::setWindowFlags(Qt::WindowFlags windowFlags)
 {
     Q_Q(QMdiSubWindow);
+
     if (!parent) {
-        q->setWindowFlags(windowFlags);
+        QWidgetPrivate::setWindowFlags(windowFlags);
         return;
     }
 
@@ -2097,7 +2097,7 @@ void QMdiSubWindowPrivate::setWindowFlags(Qt::WindowFlags windowFlags)
         delete sizeGrip;
 #endif
 
-    q->setWindowFlags(windowFlags);
+    QWidgetPrivate::setWindowFlags(windowFlags);
     updateGeometryConstraints();
     updateActions();
     QSize currentSize = q->size();