[Webkit-unassigned] [Bug 188894] New: [Cocoa] First scroll gesture in pinned, non-rubber-banding WKWebView may fail to initiate back/forward swipe

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=188894

            Bug ID: 188894
           Summary: [Cocoa] First scroll gesture in pinned,
                    non-rubber-banding WKWebView may fail to initiate
                    back/forward swipe
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit2
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mitz at webkit.org
                CC: simon.fraser at apple.com, thorton at apple.com

Sometimes the first swipe gesture in a WKWebView would fail to initiate a back/forward swipe despite the view being pinned to the edge and non-rubber-banding. This happens because of a race condition in EventDispatcher::wheelEvent, where setting the rubber-band state is dispatched to the scrolling thread, whereas querying the rubber-banding state happens immediately right after that on the event dispatcher thread, under tryToHandleWheelEvent().

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