Masayuki Nakano 38c9ff1b63 Bug 1440189 - part 1: Stop dispatching keypress event to the default event group in web content (only Nightly and early Beta) r=smaug
UI Events declares that keypress event should be fired only when the keydown
sequence produces some characters.  For conforming to UI Events and
compatibility with the other browsers, we should stop dispatching keypress
events for non-printable keys.

For getting regression reports, we should enable this new behavior only
on Nightly and early Beta.

MozReview-Commit-ID: 5IIL9huejXH

--HG--
extra : rebase_source : 0abdbe84a50d6fd1b4d52521b92e7513483b197c
2018-01-26 00:16:14 +09:00
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