[Webkit-unassigned] [Bug 32580] New: JS Event listeners should not call Document::updateStyleForAllDocuments()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=32580

           Summary: JS Event listeners should not call
                    Document::updateStyleForAllDocuments()
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore JavaScript
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jamesr at chromium.org
                CC: eric at webkit.org, hyatt at apple.com, fishd at chromium.org,
                    dglazkov at chromium.org


Currently whenever a JS event handler for a DOM event is fired at a document
context a call to Document::updateStyleForAllDocuments() is made.  This used to
be necessary since many parts of the codebase would assume styles were up to
date and there was no useful way to defer the style updates, but I believe this
is no longer the case as all layout codepaths should be ensuring that styles
are up to date.

This is really bad for pages that register DOM mutation event listeners since
styles are updated on every DOM mutation.

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