Kartikaya Gupta 36fe42d67a Bug 1642526 - Force the macOS scrollthumbs to be drawn via the custom drawing codepath. r=mstange
The default drawing codepath requests the OS to draw it, but the OS seems to
ignore the scaling factor of the transform. So when drawing scrollbars after
APZ-zooming, the scrollthumbs appear abnormally thin. This patch forces us into
the custom drawing codepath which gets scaled properly.

Differential Revision: https://phabricator.services.mozilla.com/D92677
2020-10-06 21:18:41 +00:00
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