[webkit-reviews] review requested: [Bug 98144] Fixed position visibility check does not consider descendants : [Attachment 167090] Patch

[bugzilla-daemon at webkit.org]

Sami Kyöstilä <skyostil at chromium.org> has asked  for review:
Bug 98144: Fixed position visibility check does not consider descendants
https://bugs.webkit.org/show_bug.cgi?id=98144

Attachment 167090: Patch
https://bugs.webkit.org/attachment.cgi?id=167090&action=review

------- Additional Comments from Sami Kyöstilä <skyostil at chromium.org>
Only walk subtree if necessary. Restore fixed position composition flag between
tests. PTAL?