[Webkit-unassigned] [Bug 214141] New: touchend doesn't trigger on element when touch is released after touch motion

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=214141

            Bug ID: 214141
           Summary: touchend doesn't trigger on element when touch is
                    released after touch motion
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WPE WebKit
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bst at pengutronix.de
                CC: bugs-noreply at webkitgtk.org

touchend (and some corresponding events, see below) do not trigger on touch release right after a touch motion (scroll gesture). This seems to be the case because the wpe_input_touch_event_type_up does only end the gesture, but is not handled as a general touch event in this case.

backend: wpebackend-fdo-1.6.1
wpewebkit: 2.28.2 (tarball from https://wpewebkit.org/releases/)
browser: cog 0.7.1, qt-wpe-simple-browser 0.2

How to reproduce:
Visit https://patrickhlauke.github.io/touch/tests/event-listener.html, touch the button, move finger (while still touching) on button (or off button) and release touch.

Expected behavior:
touchstart
mouseover (15ms)
mouseenter (1ms)
mousedown (0ms)
mousemove (35ms)
touchmove (128ms)
touchmove (1ms)
touchend (8ms)
mouseup (10ms)
click (0ms)
mouseout
mouseleave (3ms)

Observed behavior:
touchstart
mouseover (15ms)
mouseenter (1ms)
mousedown (1ms)
mousemove (35ms)
touchmove (128ms)
touchmove (1ms)

Similar bugs:
- https://bugs.webkit.org/show_bug.cgi?id=202527

Proposed fix:
ScrollGestureController::handleEvent (Source/WebKit/UIProcess/API/wpe/ScrollGestureController.cpp) could always return false for wpe_input_touch_event_type_up cases. This way the wpe_input_touch_event_type_up would not only end the scroll gesture (Source/WebKit/UIProcess/API/wpe/WPEView.cpp) but also be processed as any other touch up event leading to correct touchend events in javascript. I am not sure whether this is really the desired fix though but it produces the desired output (as seen in "Expected behavior" above).

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