Drawer widget in a MainWindow disappears after returning from full screen mode.

The problem was in the toggleDrawer function. We were not checking the
status of the last transition before setting the new transition, so
all the transition were treated as non-intentional.

Task-number: QTBUG-11373
Reviewed-by: Prasanth

1 files changed, 3 insertions, 1 deletions

diff --git a/src/gui/kernel/qwidget_mac.mm b/src/gui/kernel/qwidget_mac.mm
index c788711..8ae6a99 100644
--- a/src/gui/kernel/qwidget_mac.mm
+++ b/src/gui/kernel/qwidget_mac.mm
@@ -1599,12 +1599,14 @@ void QWidgetPrivate::toggleDrawers(bool visible)
             continue;
         QWidget *widget = static_cast<QWidget*>(object);
         if(qt_mac_is_macdrawer(widget)) {
+            bool oldState = widget->testAttribute(Qt::WA_WState_ExplicitShowHide);
             if(visible) {
                 if (!widget->testAttribute(Qt::WA_WState_ExplicitShowHide))
                     widget->show();
             } else {
                 widget->hide();
-                widget->setAttribute(Qt::WA_WState_ExplicitShowHide, false);
+                if(!oldState)
+                    widget->setAttribute(Qt::WA_WState_ExplicitShowHide, false);
             }
         }
     }