macOS: Simplify and fix issues with QMenuPrivate::moveWidgetToPlatformItem

View embedding when QWidget is involved is a bit finicky. This change
breaks down the steps needed to embed it into an NSMenu item, and
simplifies the process by not relying on a container widget.

The main issue is that QCocoaWindow::recreateWindowIfNeeded() will
potentially create an NSWindow for the embedded view, resulting in
a stray view. To prevent this we set the Qt::SubWindow flag on the
window, but QWidget tends to reset this flag when the widget doesn't
have a parent, so we need to be careful about which order we do the
setup.

Pick-to: 6.0 5.15
Change-Id: I505f7c0a2d8e4350511fdb01a5e9b9c623a40a41
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

0 files changed, 0 insertions, 0 deletions