Destroy discussion form

app/assets/javascripts/gl_form.js.coffee

 class @GLForm
   constructor: (@form) ->
-    @textarea = @form.find(".js-note-text")
+    @textarea = @form.find('.js-note-text')
 
     @setupForm()
 
+    @form.data 'gl-form', @
+
+  destroy: ->
+    # Destroy actions
+    actions = @form.data 'form-actions'
+    actions.clearEventListeners()
+    @form.data 'form-actions', null
+
+    # Clean form listeners
+    @clearEventListeners()
+    @form.data 'gl-form', null
+
   setupForm: ->
     isNewForm = @form.is(':not(.gfm-form)')
 
-    @form.removeClass "js-new-note-form"
+    @form.removeClass 'js-new-note-form'
 
     if isNewForm
       @form.find('.div-dropzone').remove()
       @form.addClass('gfm-form')
-      disableButtonIfEmptyField @form.find(".js-note-text"), @form.find(".js-comment-button")
+      disableButtonIfEmptyField @form.find('.js-note-text'), @form.find('.js-comment-button')
 
       # remove notify commit author checkbox for non-commit notes
       GitLab.GfmAutoComplete.setup()
@@ -32,6 +44,10 @@ class @GLForm
 
     @form.show()
 
+  clearEventListeners: ->
+    @textarea.off 'focus'
+    @textarea.off 'blur'
+
   addEventListeners: ->
     @textarea.on 'focus', ->
       $(@).closest('.md-area').addClass 'is-focused'

app/assets/javascripts/notes.js.coffee

@@ -513,6 +513,9 @@ class @Notes
   removeDiscussionNoteForm: (form)->
     row = form.closest("tr")
 
+    glForm = form.data 'gl-form'
+    glForm.destroy()
+
     form.find(".js-note-text").data("autosave").reset()
 
     # show the reply button (will only work for replies)
@@ -524,11 +527,6 @@ class @Notes
       # only remove the form
       form.remove()
 
-    # Remove the note actions
-    actions = form.data('form-actions')
-    actions.clearEventListeners()
-    form.data('form-actions', null)
-
   cancelDiscussionForm: (e) =>
     e.preventDefault()
     form = $(e.target).closest(".js-discussion-note-form")