QMacStyle: fix focus ring thickness on retina displays

NSSetFocusRingStyle() doesn't take the device pixel ratio
into account for offscreen graphics contexts. As a result,
the focus ring would appear too thin on retina displays.
Therefore, we need to render the focus ring in a more manual
way. The only added dependency is the focus ring's opacity
value and thickness.

This patch fixes CE_FocusFrame and the focus ring around
regular QPushButtons. More work needs to be done for other
widgets that currently rely on HITheme or NSControl–NSCell
to draw their focus ring.

Task-number: QTBUG-57843
Change-Id: I2c6f273698fdfd5ad7344a9688e96aef6da906f0
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

0 files changed, 0 insertions, 0 deletions