Need to disable layer sharing when a "late" compositing reason trumps overlap 
https://bugs.webkit.org/show_bug.cgi?id=197595
Summary Need to disable layer sharing when a "late" compositing reason trumps overlap
Simon Fraser (smfr)
Reported 2019-05-04 19:21:21 PDT
We currently fall into layer sharing when a layer is composited for an "overlap" reason. But after traversing descendants, we may find that we have to composite for overlap, in which case we need to undo the sharing.
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