[Webkit-unassigned] [Bug 156644] New: DOM Wheel event not triggered when scrolling up using touchpad

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=156644

            Bug ID: 156644
           Summary: DOM Wheel event not triggered when scrolling up using
                    touchpad
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Event Handling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: achicu at adobe.com

Created attachment 276510
  --> https://bugs.webkit.org/attachment.cgi?id=276510&action=review
Test case

Use the attached example to reproduce the issue on a MacBook Pro touchpad.

Move the cursor on top of the yellow box. Scroll up using two fingers gesture (in my setup scrolling up makes deltaY go negative - the delta values are displayed in the test case). Repeat the gesture very quickly. After a couple of tries the page starts scrolling up instead of sending the wheel event.

Reproduces on Nighly - Version 9.1 (11601.5.17.1, r199584) - OSX 10.11.4 (15E65)

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