735e6414f0
`synthesizePlainDragAndDrop()` sends `drop` event [1] via `PresShell` [2]. Then, the `screenX` and `screenY` values are set to `WidgetEvent::mRefPoint` [3]. Then, the `drop` event's position is recorded before dispatch [4]. So, `drop` event is fired on the target but the `mRefPoint` may be outside the target. Finally, synthesized `eMouseMove` after `eDrop` will be fired on the wrong element which is different from `eDrop`'s target. This caused the failures of `test_synthmousemove_after_dnd.html` and `test_dragdrop.html` on Android. Perhaps, we should improve `nsDOMWindowUtils` or something lower layer later. Instead, this patch fixes in `EventUtils.js` level. This makes the `createDragEventObject()`. 1. https://searchfox.org/mozilla-central/rev/6a72a6d20eeb1b20b93862a79166938d6ce794a0/testing/mochitest/tests/SimpleTest/EventUtils.js#3893-3900 2. https://searchfox.org/mozilla-central/rev/6a72a6d20eeb1b20b93862a79166938d6ce794a0/testing/mochitest/tests/SimpleTest/EventUtils.js#376-393,400 3. https://searchfox.org/mozilla-central/rev/6a72a6d20eeb1b20b93862a79166938d6ce794a0/dom/events/MouseEvent.cpp#81-84 4. https://searchfox.org/mozilla-central/rev/6a72a6d20eeb1b20b93862a79166938d6ce794a0/layout/base/PresShell.cpp#8987 Differential Revision: https://phabricator.services.mozilla.com/D251091
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