[Webkit-unassigned] [Bug 116397] New: Refactor RenderStyle::diff()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=116397

           Summary: Refactor RenderStyle::diff()
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: simon.fraser at apple.com
                CC: hyatt at apple.com, bdakin at apple.com, koivisto at iki.fi


RenderStyle::diff() is tricky for two reasons.

First, there's nothing to enforce the requirement that "more work" diffs have to be detected before "less work" diffs (i.e. we have to always check for changes that result in StyleDifferenceLayout before changes that result in StyleDifferenceRepaint).

Secondly, in some cases, even when we return, say, StyleDifferenceLayoutPositionedMovementOnly or StyleDifferenceRecompositeLayer, we also need to check for changes that require repaint, and that's not possible now.

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