[Webkit-unassigned] [Bug 190088] New: Optimize style differences that only require z-order updates

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190088

            Bug ID: 190088
           Summary: Optimize style differences that only require z-order
                    updates
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Currently we trigger layouts when opacity, filters, blend modes etc change, but these really only need updates to the z-order hierarchy and painting-related things. We should make this a new kind of StyleDifference.

Also, there may be properties now that we claim should only trigger repaints, but really need to do z-order updates (like z-index).

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