Fixed quick submit on note edit

Also removed the cloning of forms for note edits. Instead it just hides/shows the form seeing as it is already there

Closes #14094

app/assets/javascripts/notes.js.coffee

@@ -31,7 +31,7 @@ class @Notes
     $(document).on "ajax:success", ".js-discussion-note-form", @addDiscussionNote
 
     # change note in UI after update
-    $(document).on "ajax:success", "form.edit_note", @updateNote
+    $(document).on "ajax:success", "form.edit-note", @updateNote
 
     # Edit note link
     $(document).on "click", ".js-note-edit", @showEditForm
@@ -72,7 +72,7 @@ class @Notes
   cleanBinding: ->
     $(document).off "ajax:success", ".js-main-target-form"
     $(document).off "ajax:success", ".js-discussion-note-form"
-    $(document).off "ajax:success", "form.edit_note"
+    $(document).off "ajax:success", "form.edit-note"
     $(document).off "click", ".js-note-edit"
     $(document).off "click", ".note-edit-cancel"
     $(document).off "click", ".js-note-delete"
@@ -347,21 +347,25 @@ class @Notes
     note = $(this).closest(".note")
     note.find(".note-body > .note-text").hide()
     note.find(".note-header").hide()
-    base_form = note.find(".note-edit-form")
-    form = base_form.clone().insertAfter(base_form)
-    form.addClass('current-note-edit-form gfm-form')
-    form.find('.div-dropzone').remove()
+    form = note.find(".note-edit-form")
+    isNewForm = form.is(':not(.gfm-form)')
+    if isNewForm
+      form.addClass('gfm-form')
+    form.addClass('current-note-edit-form')
+    form.show()
 
     # Show the attachment delete link
     note.find(".js-note-attachment-delete").show()
 
     # Setup markdown form
+    if isNewForm
       GitLab.GfmAutoComplete.setup()
       new DropzoneInput(form)
 
-    form.show()
     textarea = form.find("textarea")
     textarea.focus()
+
+    if isNewForm
       autosize(textarea)
 
     # HACK (rspeicher/DouweM): Work around a Chrome 43 bug(?).
@@ -371,6 +375,7 @@ class @Notes
     textarea.val ""
     textarea.val value
 
+    if isNewForm
       disableButtonIfEmptyField textarea, form.find(".js-comment-button")
 
   ###
@@ -383,7 +388,9 @@ class @Notes
     note = $(this).closest(".note")
     note.find(".note-body > .note-text").show()
     note.find(".note-header").show()
-    note.find(".current-note-edit-form").remove()
+    note.find(".current-note-edit-form")
+      .removeClass("current-note-edit-form")
+      .hide()
 
   ###
   Called in response to deleting a note of any kind.

app/views/projects/notes/_edit_form.html.haml

 .note-edit-form
-  = form_for note, url: namespace_project_note_path(@project.namespace, @project, note), method: :put, remote: true, authenticity_token: true, class: 'js-quick-submit' do |f|
+  = form_for note, url: namespace_project_note_path(@project.namespace, @project, note), method: :put, remote: true, authenticity_token: true, html: { class: 'edit-note js-quick-submit' } do |f|
     = note_target_fields(note)
     = render layout: 'projects/md_preview', locals: { preview_class: 'md-preview' } do
       = render 'projects/zen', f: f, attr: :note, classes: 'note_text js-note-text js-task-list-field'