1 files changed, 12 insertions, 10 deletions

diff --git a/src/widgets/widgets/qmainwindow.cpp b/src/widgets/widgets/qmainwindow.cpp
index 2477510520..e32e379198 100644
--- a/src/widgets/widgets/qmainwindow.cpp
+++ b/src/widgets/widgets/qmainwindow.cpp
@@ -61,7 +61,7 @@
 #ifdef Q_OS_OSX
 #include <qpa/qplatformnativeinterface.h>
 #endif
-#ifdef Q_DEAD_CODE_FROM_QT4_MAC
+#if 0 // Used to be included in Qt4 for Q_WS_MAC
 #include <private/qt_mac_p.h>
 #include <private/qt_cocoa_helpers_mac_p.h>
 QT_BEGIN_NAMESPACE
@@ -80,7 +80,7 @@ public:
 #ifdef Q_OS_OSX
             , useUnifiedToolBar(false)
 #endif
-#ifdef Q_DEAD_CODE_FROM_QT4_MAC
+#if 0 // Used to be included in Qt4 for Q_WS_MAC
             , useHIToolBar(false)
             , activateUnifiedToolbarAfterFullScreen(false)
 #endif
@@ -95,7 +95,7 @@ public:
 #ifdef Q_OS_OSX
     bool useUnifiedToolBar;
 #endif
-#ifdef Q_DEAD_CODE_FROM_QT4_MAC
+#if 0 // Used to be included in Qt4 for Q_WS_MAC
     bool useHIToolBar;
     bool activateUnifiedToolbarAfterFullScreen;
 #endif
@@ -682,8 +682,10 @@ QWidget *QMainWindow::takeCentralWidget()
 {
     Q_D(QMainWindow);
     QWidget *oldcentralwidget = d->layout->centralWidget();
-    oldcentralwidget->setParent(0);
-    d->layout->setCentralWidget(0);
+    if (oldcentralwidget) {
+        oldcentralwidget->setParent(0);
+        d->layout->setCentralWidget(0);
+    }
     return oldcentralwidget;
 }
 
@@ -1110,7 +1112,7 @@ void QMainWindow::addDockWidget(Qt::DockWidgetArea area, QDockWidget *dockwidget
     d_func()->layout->removeWidget(dockwidget); // in case it was already in here
     addDockWidget(area, dockwidget, orientation);
 
-#ifdef Q_DEAD_CODE_FROM_QT4_MAC     //drawer support
+#if 0 // Used to be included in Qt4 for Q_WS_MAC     //drawer support
     QMacAutoReleasePool pool;
     extern bool qt_mac_is_macdrawer(const QWidget *); //qwidget_mac.cpp
     if (qt_mac_is_macdrawer(dockwidget)) {
@@ -1514,7 +1516,7 @@ bool QMainWindow::event(QEvent *event)
             if (!d->explicitIconSize)
                 setIconSize(QSize());
             break;
-#ifdef Q_DEAD_CODE_FROM_QT4_MAC
+#if 0 // Used to be included in Qt4 for Q_WS_MAC
         case QEvent::Show:
             if (unifiedTitleAndToolBarOnMac())
                 d->layout->syncUnifiedToolbarVisibility();
@@ -1533,7 +1535,7 @@ bool QMainWindow::event(QEvent *event)
                 }
             }
             break;
-#endif // Q_DEAD_CODE_FROM_QT4_MAC
+#endif
 #if !defined(QT_NO_DOCKWIDGET) && !defined(QT_NO_CURSOR)
        case QEvent::CursorChange:
            // CursorChange events are triggered as mouse moves to new widgets even
@@ -1589,7 +1591,7 @@ void QMainWindow::setUnifiedTitleAndToolBarOnMac(bool set)
     }
 #endif
 
-#ifdef Q_DEAD_CODE_FROM_QT4_MAC
+#if 0 // Used to be included in Qt4 for Q_WS_MAC
     Q_D(QMainWindow);
     if (!isWindow() || d->useHIToolBar == set || QSysInfo::MacintoshVersion < QSysInfo::MV_10_3)
         return;
@@ -1624,7 +1626,7 @@ bool QMainWindow::unifiedTitleAndToolBarOnMac() const
 #ifdef Q_OS_OSX
     return d_func()->useUnifiedToolBar;
 #endif
-#ifdef Q_DEAD_CODE_FROM_QT4_MAC
+#if 0 // Used to be included in Qt4 for Q_WS_MAC
     return d_func()->useHIToolBar && !testAttribute(Qt::WA_MacBrushedMetal) && !(windowFlags() & Qt::FramelessWindowHint);
 #endif
     return false;