[Webkit-unassigned] [Bug 32303] New: Middle-mouse button not firing mousedown DOM event when autoscroll happens

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=32303

           Summary: Middle-mouse button not firing mousedown DOM event
                    when autoscroll happens
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Windows Vista
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebCore JavaScript
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: webkit at appsforartists.com


In Chrome and Safari on Windows, middle-clicking only dispatches a MouseEvent
if auto-scroll doesn't spawn.  Firefox, IE, and Opera dispatch the mousedown
event, even if they support and spawn autoscroll.  The Mac versions of Chrome
and Safari don't spawn autoscroll, and they dispatch the event properly.

Steps to reproduce:
1. Navigate to a page with a scrollbar.
2. Open the JavaScript console and enter the following:
addEventListener('mousedown', function(event) { console.log(event.button) } );
3. Middle-click on the page

Expected result:
'1' is traced in the JavaScript console.  If event.preventDefault() is not
called, the scroll arrows appear.

Actual result:
The auto-scroll arrows appear, but no event is dispatched.

This has been tested in Chrome 4.0.249.30, Safari 4.0.3, and the Windows WebKit
nightly.  Each fails.

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