[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

Tomoki Imai <Tomoki.Imai at sony.com> changed:

           What    |Removed                     |Added
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 Attachment #354645|0                           |1
        is obsolete|                            |

--- Comment #3 from Tomoki Imai <Tomoki.Imai at sony.com> ---
Created attachment 354649

  --> https://bugs.webkit.org/attachment.cgi?id=354649&action=review

Use CompositeCopy to update bitmap to overwrite existing surface

I updated ChangeLog as the bugtitle doesn't match to bugzilla, and the style is different from the others.

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