QMainWindow: fixed a crash in some cases when deleting the widget

This happened because the rubberband used as a gapindicator was not
allocated on the heap and might have been deleted by the QMainWindow
destructor.

Task-number: 257626

2 files changed, 6 insertions, 13 deletions

diff --git a/src/gui/widgets/qmainwindowlayout.cpp b/src/gui/widgets/qmainwindowlayout.cpp
index a02dca3a1b..ad608d3127 100644
--- a/src/gui/widgets/qmainwindowlayout.cpp
+++ b/src/gui/widgets/qmainwindowlayout.cpp
@@ -1639,7 +1639,7 @@ QMainWindowLayout::QMainWindowLayout(QMainWindow *mainwindow)
     , widgetAnimator(this)
     , pluggingWidget(0)
 #ifndef QT_NO_RUBBERBAND
-    , gapIndicator(QRubberBand::Rectangle, mainwindow)
+    , gapIndicator(new QRubberBand(QRubberBand::Rectangle, mainwindow))
 #endif //QT_NO_RUBBERBAND
 {
 #ifndef QT_NO_DOCKWIDGET
@@ -1655,8 +1655,8 @@ QMainWindowLayout::QMainWindowLayout(QMainWindow *mainwindow)
 
 #ifndef QT_NO_RUBBERBAND
     // For accessibility to identify this special widget.
-    gapIndicator.setObjectName(QLatin1String("qt_rubberband"));
-    gapIndicator.hide();
+    gapIndicator->setObjectName(QLatin1String("qt_rubberband"));
+    gapIndicator->hide();
 #endif
     pluggingWidget = 0;
 
@@ -1762,14 +1762,8 @@ QLayoutItem *QMainWindowLayout::unplug(QWidget *widget)
 void QMainWindowLayout::updateGapIndicator()
 {
 #ifndef QT_NO_RUBBERBAND
-    if (widgetAnimator.animating() || currentGapPos.isEmpty()) {
-        gapIndicator.hide();
-    } else {
-        if (gapIndicator.geometry() != currentGapRect)
-            gapIndicator.setGeometry(currentGapRect);
-        if (!gapIndicator.isVisible())
-            gapIndicator.show();
-    }
+    gapIndicator->setVisible(!widgetAnimator.animating() && !currentGapPos.isEmpty());
+    gapIndicator->setGeometry(currentGapRect);
 #endif
 }
 
diff --git a/src/gui/widgets/qmainwindowlayout_p.h b/src/gui/widgets/qmainwindowlayout_p.h
index a7f70b45b9..45f62cd437 100644
--- a/src/gui/widgets/qmainwindowlayout_p.h
+++ b/src/gui/widgets/qmainwindowlayout_p.h
@@ -59,7 +59,6 @@
 
 #include "QtGui/qlayout.h"
 #include "QtGui/qtabbar.h"
-#include "QtGui/qrubberband.h"
 #include "QtCore/qvector.h"
 #include "QtCore/qset.h"
 #include "QtCore/qbasictimer.h"
@@ -284,7 +283,7 @@ public:
     QRect currentGapRect;
     QWidget *pluggingWidget;
 #ifndef QT_NO_RUBBERBAND
-    QRubberBand gapIndicator;
+    QRubberBand *gapIndicator;
 #endif
 
     QList<int> hover(QLayoutItem *widgetItem, const QPoint &mousePos);