unarist 4e35ce8269 Fix Esc hotkey behavior (#7199)
This fixes following cases which causes hotkey action accidentally:

* hitting Esc key to cancel text composition (mostly in CJK)

  Although events on cancelling composition are still heavily
  browser / input method dependent, but this implementation would
  covers current UI Events spec and some exceptions.

* hitting Esc key to close autocomplete suggestions

This PR changes to use keydown event instead of keyup event as well as other hotkeys.
2018-04-20 14:04:16 +02:00
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