When enabled, all QWindows will be backed by a NSWindow.
This is unlike the default where only top-level
QWindows get a NSWindow.
The QWindow still has (Q)NSView as the NSWindow content
view. The return value of the winId functions are
still the NSView and is not affected by this switch.
Change-Id: I131b89af04c09451a6e7515d1da3f7498f53979a
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@theqtcompany.com>
Reviewed-by: Timur Pocheptsov <Timur.Pocheptsov@digia.com>
f7047d52da