Client: support high-dpi mode for window icon
requested to merge asturmlechner/qtwayland:asturmlechner/QTBUG-90530-high-dpi-window-icon into kde/5.15
Fixes: QTBUG-90530 Pick-to: 6.3 6.2 5.15 Change-Id: Ib1f36e1cb89352dfac8a385a7b097cfc0226e813 Reviewed-by: David Edmundson davidedmundson@kde.org Reviewed-by: Tor Arne Vestbø tor.arne.vestbo@qt.io (cherry picked from commit fc91cd6b)