Revert "Prevent the Return key from submitting while composing using an IME"

This reverts commit d13f1cf7b8.

app/assets/javascripts/answerbox/comment.coffee

@@ -13,14 +13,8 @@ $(document).on "click", "button[name=ab-comments]", ->
       commentBox.slideUp()
       btn[0].dataset.state = 'hidden'
 
-isComposing = false
-compositionHasJustEnded = false
 
 $(document).on "keyup", "input[name=ab-comment-new]", (evt) ->
-  if isComposing or compositionHasJustEnded
-    compositionHasJustEnded = false
-    return
-
   input = $(this)
   aid = input[0].dataset.aId
   ctr = $("span#ab-comment-charcount-#{aid}")
@@ -55,18 +49,6 @@ $(document).on "keyup", "input[name=ab-comment-new]", (evt) ->
       complete: (jqxhr, status) ->
         input.removeAttr 'disabled'
 
-# IME Return key handling
-$(document).on "compositionstart", "input[name=ab-comment-new]", (evt) ->
-  isComposing = true
-
-$(document).on "compositionend", "input[name=ab-comment-new]", (evt) ->
-  isComposing = false
-  compositionHasJustEnded = true
-
-$(document).on "keydown", "input[name=ab-comment-new]", (evt) ->
-  # 229 is a special keyCode for events processed by an IME
-  # https://developer.mozilla.org/en-US/docs/Web/API/Document/keyup_event
-  compositionHasJustEnded = false unless event.which == 229
 
 # character count
 $(document).on "input", "input[name=ab-comment-new]", (evt) ->