macOS: Defer update request on drawRect: when a real expose event is needed

The semantics of QWindow::requestUpdate() is that it's used when the
window needs updates outside of the normal window invalidation callbacks
such as expose and resize events, e.g. when doing animations.

As a result, user code might not be prepared to handle window
invalidations in the update-request callback, assuming those
will still be delivered as normal, so that's what we do.

This was exposed by resizing one of the simpler Qt Quick examples,
where the resize's expose event was delivered as an update request,
but didn't trigger an unconditional draw of the window as it should,
as the scenegraph didn't change in response to the resize, which is
typical for an update request.

Change-Id: Ida8f85f1cf61c332aa9b199520e6854c48d3ab40
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

0 files changed, 0 insertions, 0 deletions