[Webkit-unassigned] [Bug 129034] New: isContentEditable shouldn't trigger synchronous style recalc in most cases

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=129034

           Summary: isContentEditable shouldn't trigger synchronous style
                    recalc in most cases
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML Editing
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: mjs at apple.com, darin at apple.com, sam at webkit.org,
                    koivisto at iki.fi, barraclough at apple.com
            Blocks: 127832


Right now isContentEditable and related functions forces style recalc just to check
the computed value of -wekbit-user-modify but we shouldn't have to on most documents
as -webkit-user-modify CSS property is almost never used in practice.

On documents that don't use -webkit-user-modify, we should be able to simply traverse up
the DOM tree and find the first node with contenteditable content attribute.

We could even have some flag on Node if we wanted to make it super fast.

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