[webkit-reviews] review requested: [Bug 78186] Avoid compositing invisible fixed positioned elements : [Attachment 126418] patch with layout test

[bugzilla-daemon at webkit.org]

Xianzhu Wang <wangxianzhu at chromium.org> has asked  for review:
Bug 78186: Avoid compositing invisible fixed positioned elements
https://bugs.webkit.org/show_bug.cgi?id=78186

Attachment 126418: patch with layout test
https://bugs.webkit.org/attachment.cgi?id=126418&action=review