Cococa integration - close popups in a windowWillClose callback

'Orphan' popups were already partially fixed as a side-effect of
10126b37d2 (orphan since the 'parent' is moving
but popup stays in a now wrong position).
This patch also tries to fix the case when a window closed.

Change-Id: I0bbf474ab4f3b845d8bd337dae2abbae23192d0e
Task-number: QTBUG-46262
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@theqtcompany.com>
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

src/plugins/platforms/cocoa/qcocoawindow.h

@@ -219,6 +219,7 @@ public:
     void windowDidResize();
     void windowDidEndLiveResize();
     bool windowShouldClose();
+    void windowWillClose();
     bool windowIsPopupType(Qt::WindowType type = Qt::Widget) const;
 
     void setSynchedWindowStateFromWindow();

src/plugins/platforms/cocoa/qcocoawindow.mm

@@ -78,6 +78,14 @@ static bool isMouseEvent(NSEvent *ev)
     }
 }
 
+static void qt_closePopups()
+{
+    while (QCocoaWindow *popup = QCocoaIntegration::instance()->popPopupWindow()) {
+        QWindowSystemInterface::handleCloseEvent(popup->window());
+        QWindowSystemInterface::flushWindowSystemEvents();
+    }
+}
+
 @implementation QNSWindowHelper
 
 @synthesize window = _window;
@@ -1220,10 +1228,7 @@ void QCocoaWindow::setEmbeddedInForeignView(bool embedded)
 void QCocoaWindow::windowWillMove()
 {
     // Close any open popups on window move
-    while (QCocoaWindow *popup = QCocoaIntegration::instance()->popPopupWindow()) {
-        QWindowSystemInterface::handleCloseEvent(popup->window());
-        QWindowSystemInterface::flushWindowSystemEvents();
-    }
+    qt_closePopups();
 }
 
 void QCocoaWindow::windowDidMove()
@@ -1267,6 +1272,13 @@ bool QCocoaWindow::windowShouldClose()
     return accepted;
 }
 
+void QCocoaWindow::windowWillClose()
+{
+    // Close any open popups on window closing.
+    if (window() && !windowIsPopupType(window()->type()))
+        qt_closePopups();
+}
+
 void QCocoaWindow::setSynchedWindowStateFromWindow()
 {
     if (QWindow *w = window())

src/plugins/platforms/cocoa/qnswindowdelegate.h

@@ -57,6 +57,7 @@
 - (void)windowWillMove:(NSNotification *)notification;
 - (BOOL)windowShouldClose:(NSNotification *)notification;
 - (BOOL)windowShouldZoom:(NSWindow *)window toFrame:(NSRect)newFrame;
+- (void)windowWillClose:(NSNotification *)notification;
 
 @end
 

src/plugins/platforms/cocoa/qnswindowdelegate.mm

@@ -115,4 +115,11 @@
     return YES;
 }
 
+- (void)windowWillClose:(NSNotification *)notification
+{
+    Q_UNUSED(notification);
+    if (m_cocoaWindow)
+        m_cocoaWindow->windowWillClose();
+}
+
 @end