[Webkit-unassigned] [Bug 153064] New: touchcancel not fired when context menu shown, touchmove/touchend still fired at document

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=153064

            Bug ID: 153064
           Summary: touchcancel not fired when context menu shown,
                    touchmove/touchend still fired at document
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: Unspecified
               URL: http://patrickhlauke.github.io/touch/tests/event-liste
                    ner_link.html
                OS: iOS 9.0
            Status: NEW
          Severity: Normal
          Priority: P3
         Component: HTML Events
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: redux at splintered.co.uk
                CC: benjamin at webkit.org, dino at apple.com

Created attachment 268867
  --> https://bugs.webkit.org/attachment.cgi?id=268867&action=review
Demonstration of issue using tappy.js

When the Safari context menu (e.g. for links) is shown, it seems that events such as touchmove and touchend are still fired to the underlying page, rather than touchcancel. This can result in unexpected behavior if listening for, say, touchend on a link (see https://github.com/filamentgroup/tappy/issues/29 and the related video https://www.youtube.com/watch?v=P_YJe1MQ4m8)

Steps to Reproduce:

1. visit http://patrickhlauke.github.io/touch/tests/event-listener_link.html
2. long-press on the "Test button!" link
3. context menu appears

Actual result:

- as long as the finger remains in contact with the touchscreen when the context menu appears, it is still possible to scroll/interact with the underlying document; touchmove events are fired; lifting the finger off the screen (to interact with the context menu options) fires touchend - see https://www.youtube.com/watch?v=oggIAZ9uHug

Expected result:

- as soon as the context menu appears, fire touchcancel  - which is what happens in Chrome/Android, see https://www.youtube.com/watch?v=Yoja9elNArs

Tested on iOS 9.2 (13C75)

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