...when presenting from the main thread.
Make resizing nice and smooth in application that render and present
on the main thread. This includes Qt Quick applications when ran
with QSG_RENDER_LOOP=basic, as well as QQuickWidget-based widget apps
and anything using the QRhi-based backingstore flushing, and plain
QWindow apps that use QRhi on the main thread.
Allow opting out with an environment variable (QT_MTL_NO_TRANSACTION),
following the existing patterns of some of the other backends (such as
QT_D3D_NO_xxxx). This can be handy in case it turns out setting
presentsWithTransaction is not desired in some very specific case.
Task-number: QTBUG-107198
Change-Id: Id0f4e5a509076dd24c03d243c4f098ddb139d7af
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
401edea982