[Webkit-unassigned] [Bug 169509] New: If a scrollable layer is at its end position and user tries to scroll it with a down-scroll gesture, it will not scroll

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=169509

            Bug ID: 169509
           Summary: If a scrollable layer is at its end position and user
                    tries to scroll it with a down-scroll gesture, it will
                    not scroll
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: noam at webkit.org
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 304142
  --> https://bugs.webkit.org/attachment.cgi?id=304142&action=review
Simple HTML file reproducing the bug

To reproduce:
- Open the attachment in safari on Mac (nightly, releases, anything)
- Scroll the DIV to the end
- Wait 1-2 seconds until the scrollbars disappears
- Try to scroll by first moving the two fingers downwards and then upwards - works.
- Wait 1-2 more seconds until the scrollbars disappears
- Try to scroll by first moving the two fingers upwards and then upwards - page will scroll instead of the scroll layer.

Seems like the code is set up so that when the beginning gesture is "dead end" it will not bind the touch scrolling to the layer at all.

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