[Webkit-unassigned] [Bug 190105] Setting a style height value to the existing value still triggers a clone of StyleBoxData and thus slows down RenderStyle::diff

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190105

--- Comment #1 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
Seen in MotionMark leaves test.

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