[Webkit-unassigned] [Bug 116936] New: Do not dispatch change event twice in single step action

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=116936

           Summary: Do not dispatch change event twice in single step
                    action
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: BlinkMergeCandidate
          Severity: Normal
          Priority: P2
         Component: Forms
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: jonlee at apple.com


Consider merging https://chromium.googlesource.com/chromium/blink/+/2a3d29d9f866a3074c535cf31f5c6ffa28eef03e

If an input element has no value, and step-up or step-down is requested, we set
the default value, dispatched a change event, modified it, then dispatched
another change event. The first change event is unnecessary, and harmful.

Also, add EvenQueueScope to avoid to make similar problems in the future.

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