Apply a basis change on the perspective transform. #3173
Merged
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When applying async scrolling transforms, the perspective matrix also
needs to be adjusted with a basis change. This is a version of #3154
that doesn't break async scrolling on 2D-transformed elements. Although
this passes the required test cases and displays correct behaviour,
the intuition behind why this works is not really clear to me; see
https://bugzilla.mozilla.org/show_bug.cgi?id=1415272#c23 onwards for
some discussion.
This change is