macOS: Redraw window bottom corners after synchronous backing store flush

Flushing outside of the display cycle does not care about any ordering
between views, including the NSThemeFrame responsible for drawing the
rounded corners of the window.

Since Qt Widgets is doing a lot of synchronous flushing (for now, until
we plumb update() to requestUpdate(), or enable layer-backing), we add
a workaround that explicitly draws the corners after flushing, just like
the logic in [NSView displayIfNeeded]. This is the same workaround used
by WebKit: https://trac.webkit.org/changeset/85376/webkit

Change-Id: I884152cdb2685569704e577b64b5ae278ed82c21
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

0 files changed, 0 insertions, 0 deletions