Squish: Stabilize invoking context menu items on Mac

Change-Id: I64ed356b6120c38d51c646ae409bbbc3a4fe9e8e
Reviewed-by: Robert Loehning <robert.loehning@digia.com>

tests/system/shared/editor_utils.py

@@ -47,6 +47,8 @@ def menuVisibleAtEditor(editor, menuInList):
     menuInList[0] = None
     try:
         menu = waitForObject("{type='QMenu' unnamed='1' visible='1'}", 500)
+        if platform.system() == 'Darwin':
+            menu.activateWindow()
         success = menu.visible and widgetContainsPoint(editor, menu.mapToGlobal(QPoint(0, 0)))
         if success:
             menuInList[0] = menu