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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 |
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