[Webkit-unassigned] [Bug 73097] New: Calling event.preventDefault() on mouse events messes up scroll state in presence of iframes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=73097

           Summary: Calling event.preventDefault() on mouse events messes
                    up scroll state in presence of iframes
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: zachlloyd at google.com


Created an attachment (id=116546)
 --> (https://bugs.webkit.org/attachment.cgi?id=116546&action=review)
Repro case for the bug.

To repro the bug:

1) unpack the attacked zip and load iframe_scrolling_bug.html
2) Click on the scrollhandle of the div within the iframe and without releasing the button, move the mouse pointer to the outer frame.
3) Release the mouse button.
4) Now move the mouse pointer back over the scrollbar within the frame.
5) Notice that even without clicking again the scrollbar scrolls the inner content as you move the mouse over the scrollbar.  It is somehow "stuck" in the scrolling state.

The bug is triggered because of the cal to evt.preventDefault() on the initial mousedown on the div.  If you unclick the option for preventing default, the bug does not occur.

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