The setting is not relevant for modern macOS applications, and none of
the applications shipped with macOS today are affected by it.
The only code path in macOS that picks it up is +[NSFont initialize] in
the UIFoundation framework, storing it for later so that -[NSFont screenFont]
and -[NSFont screenFontWithRenderingMode:] can use it, but these APIs are
deprecated and we don't use them in Qt.
Other NSFont code paths will not hit these APIs unless screen font
substitution is enabled, something it hasn't been since OSX 10.7.
https://preview.tinyurl.com/yctpfnqp
Removing handling of this setting allows us to simplify the reasoning
for whether or not antialiasing and font smoothing is enabled for a given
engine.
Change-Id: Ie2809052a1a0815d9bddedd4a6236eb6c898f993
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>
3944f45c4d