[Webkit-unassigned] [Bug 239014] New: [Pointer events] pointerend/pointercancel event never fired when swiping to forwards a page

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=239014

            Bug ID: 239014
           Summary: [Pointer events] pointerend/pointercancel event never
                    fired when swiping to forwards a page
           Product: WebKit
           Version: Safari 15
          Hardware: iPhone / iPad
                OS: iOS 15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: pfg.webkit at pfg.pw

Reproduction:

1. Open this url: https://patrickhlauke.github.io/touch/gesture-touch/pointerevents.html
2. Navigate to any other url
3. Go back
4. Start swiping from the right edge of the screen to go forwards a page
5. Move your finger back to the right edge of the screen to cancel that
6. Notice that a pointerend/pointercancel event is never fired

I would expect a pointercancel event to be fired as soon as the page starts moving for the back/forwards animation, or at least when the finger is lifted, but one is never fired at all causing pages to get stuck expecting more events that never come.

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