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epriestley bf43d4cf2a Don't mutate DOM on touch-originated cursor events in Differential
Summary:
Fixes T10229. Broadly:

  - When the user hovers over a line number or inline comment, we update the yellow reticle to highlight the relevant lines. Specifically, this is in response to a `mouseover` event.
  - On touch devices, touches fire `mouseover` and if you mutate the DOM inside the event, the device aborts the touch.

To remedy this:

  - Distingiush between mouse-originated and touch-originated cursor events.
    - We do this, roughly, by setting a flag when we see "touchstart", and clearing it when we see the second copy of any unique cursor event.
    - This method is complex, but should be robust to any implementation differences between devices (for example, it will work no matter which order the events are fired in).
    - This method should also produce the correct results on weird devices that have both mouse-devices and touch-devices available for cursor input.
  - When we see a touch-originated `mouseover` or `mouseout`, don't mutate the DOM.
  - Put an extra DOM mutation into the `click` event to improve highlighting behavior on touch devices.

Test Plan:
  - In iOS Simulator (4s, iOS 9.2), clicked various inline actions ("Reply", "Hide", "Done", "Cancel", line numbers, etc). Got responses after a single touch.
  - Verified hover + click behavior on a desktop.
  - Logged and examined a bunch of events as a general sanity check.

Reviewers: chad

Reviewed By: chad

Subscribers: aljungberg

Maniphest Tasks: T10229

Differential Revision: https://secure.phabricator.com/D15136
2016-01-29 06:55:41 -08:00
..
css Add some additional padding before footer on profiles 2016-01-29 02:31:31 +00:00
externals Don't mutate DOM on touch-originated cursor events in Differential 2016-01-29 06:55:41 -08:00
favicons Add mask-icon for Safari pinned tab 2015-11-22 13:04:06 -08:00
image Remove defunt project image choices 2016-01-19 08:50:59 -08:00
js Don't mutate DOM on touch-originated cursor events in Differential 2016-01-29 06:55:41 -08:00