You know, when Korean IME commits string, then it sometimes set next preedit string. So reseting context causes that next preedit string is committed.
So we shouldn't reset IME context with preedit_end.
MozReview-Commit-ID: CZJJvYjcrKY
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extra : rebase_source : d7e2e80930355794a40466c68fe22e43e7164d72