The implementation of [NSApplication setWindowsMenu:] seems to look
for the last item in the menu, but doesn't guard the check for the
menu having items. Instead it guards on another array being non-empty,
and in some situation this array has items of type NSWindowMenuItem
while our window menu is empty (FB13369198).
To work around this we insert a hidden dummy item into the menu.
Fixes: PYSIDE-2525
Pick-to: 6.5 6.6
Change-Id: Iaa9dbc9454249f4eb34f8a338d0cc23685f0025a
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
0a0f7b864b