[Webkit-unassigned] [Bug 191577] [cairo] BackingStore::incorporateUpdate should use CompositeCopy to support drawsBackground=false in general Cairo ports

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191577

--- Comment #1 from Tomoki Imai <Tomoki.Imai at sony.com> ---
Created attachment 354644

  --> https://bugs.webkit.org/attachment.cgi?id=354644&action=review

Actual result of the testcase

At first, MiniBrowser opens WebKitGTK+ webpage. 
After that, I opened Attachment 354641.

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