[Webkit-unassigned] [Bug 144037] New: Avoid doing work when StyleDifference is StyleDifferenceEqual

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=144037

            Bug ID: 144037
           Summary: Avoid doing work when StyleDifference is
                    StyleDifferenceEqual
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (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: akling at apple.com, hyatt at apple.com, koivisto at iki.fi

We do work in RenderElement::setStyle(), and the various implementations of styleDidChange() when the style is known to be unchanged. I think we can avoid doing a lot of that work.

Maybe we should short-circuit for the SyntheticStyleChange case that only exists to trigger compositing updates.

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