Allow a small amount of touchMove before cancelling tap event.

[riley-indochino]

This improves the user experience on touch screens by avoiding unintended cancelled clicks.

[tilomitra]

Thanks for this pull! However, by removing the code that detaches the event handlers in the touchMove handler, we will be left with handlers that are not detached if the abs(startXY - endXY) > 15.

With this code change, these handlers should be removed in the touchEnd callback in an else case.

This test also causes a test failure (on purpose), due to the change to the touchMove handler. Could you add a test case to this code change to address this change, and remove the current test: touchmove test?

[riley-indochino]

I added the code to detach the event handlers in an else block in the touchEnd callback, but when I run the test event-tap-unit-tests.html with the changes, or without the changes they all pass. Is there a reason why these would pass when they shouldn't be?

[tilomitra]

I bundled this fix into this pull request: #986

[tilomitra]

This is done, since we merged #986.