[Webkit-unassigned] [Bug 146497] New: REGRESSION (r184296): View keeps scrolling upward

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=146497

            Bug ID: 146497
           Summary: REGRESSION (r184296): View keeps scrolling upward
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bfulgham at webkit.org

The change in <http://trac.webkit.org/changeset/184296> introduced a regression on certain sites that handle scrolling manually. The change in r184296 was designed to make sure that the logic to notify scroll bars that they should re-hide was not bypassed when the wheel event had zero movement, which is typical for "end scroll" state.

Unfortunately, on certain sites this had the undesirable side-effect of triggering a programmatic scroll event in JavaScript at the end of the gesture.

I'm working on a reduced test case for this behavior, but I have a fix for the web page showing the problem.

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