Masayuki Nakano d68f6fc838 Bug 1220696 - part 6: Support insertLineBreak and insertParagraphSeparator commands in <textarea> r=smaug
Those command handlers just check whether the given editor is an `HTMLEditor`
or not.  Therefore, we should make them check whether the given editor is
a single line editor or not instead.

Differential Revision: https://phabricator.services.mozilla.com/D108572
2021-03-24 01:55:09 +00:00
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