[Webkit-unassigned] [Bug 143327] New: No-op inline style changes cause style recalcs

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=143327

            Bug ID: 143327
           Summary: No-op inline style changes cause style recalcs
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: esprehn at chromium.org

Confirmed in r182227

<div id="test"></div>
<script>
var test = document.getElementById("test");
setInterval(function() {
    test.style.top = "0px";
});
</script>

This causes an infinite number of style recalcs even though it's just assigning the same number repeatedly. It seems the parser returns true to mean "successfully parsed", and the inline style machinery interprets that bool to mean "something changed". Probably want to compare the CSSProperty objects to see that they're actually different instead (different value, different important).

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