3 files changed, 17 insertions, 4 deletions
diff --git a/src/plugins/platforms/cocoa/qcocoawindow.h b/src/plugins/platforms/cocoa/qcocoawindow.h
index 91eaea21b6..b82d096bb5 100644
--- a/src/plugins/platforms/cocoa/qcocoawindow.h
+++ b/src/plugins/platforms/cocoa/qcocoawindow.h
@@ -136,6 +136,8 @@ public:
     bool windowShouldClose();
     bool windowIsPopupType(Qt::WindowType type = Qt::Widget) const;
 
+    void setSynchedWindowStateFromWindow();
+
     NSInteger windowLevel(Qt::WindowFlags flags);
     NSUInteger windowStyleMask(Qt::WindowFlags flags);
     void setWindowShadow(Qt::WindowFlags flags);
diff --git a/src/plugins/platforms/cocoa/qcocoawindow.mm b/src/plugins/platforms/cocoa/qcocoawindow.mm
index f8d0eafcb3..d9043979d6 100644
--- a/src/plugins/platforms/cocoa/qcocoawindow.mm
+++ b/src/plugins/platforms/cocoa/qcocoawindow.mm
@@ -725,6 +725,12 @@ bool QCocoaWindow::windowShouldClose()
     return accepted;
 }
 
+void QCocoaWindow::setSynchedWindowStateFromWindow()
+{
+    if (QWindow *w = window())
+        m_synchedWindowState = w->windowState();
+}
+
 bool QCocoaWindow::windowIsPopupType(Qt::WindowType type) const
 {
     if (type == Qt::Widget)
diff --git a/src/plugins/platforms/cocoa/qnsview.mm b/src/plugins/platforms/cocoa/qnsview.mm
index 10fb293ec0..529a0ccfe7 100644
--- a/src/plugins/platforms/cocoa/qnsview.mm
+++ b/src/plugins/platforms/cocoa/qnsview.mm
@@ -290,10 +290,15 @@ static QTouchDevice *touchDevice = 0;
 
 #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
     if (QSysInfo::QSysInfo::MacintoshVersion >= QSysInfo::MV_10_7) {
-        if (notificationName == NSWindowDidEnterFullScreenNotification) {
-            QWindowSystemInterface::handleWindowStateChanged(m_window, Qt::WindowFullScreen);
-        } else if (notificationName == NSWindowDidExitFullScreenNotification) {
-            QWindowSystemInterface::handleWindowStateChanged(m_window, Qt::WindowNoState);
+        if (notificationName == NSWindowDidEnterFullScreenNotification
+            || notificationName == NSWindowDidExitFullScreenNotification) {
+            Qt::WindowState newState = notificationName == NSWindowDidEnterFullScreenNotification ?
+                        Qt::WindowFullScreen : Qt::WindowNoState;
+            QWindowSystemInterface::handleWindowStateChanged(m_window, newState);
+            // We want to read the window state back from the window,
+            // but the event we just sent may be asynchronous.
+            QWindowSystemInterface::flushWindowSystemEvents();
+            m_platformWindow->setSynchedWindowStateFromWindow();
         }
     }
 #endif