Fix handling form errors.

app/views/notes/_form.html.haml

@@ -5,11 +5,6 @@
   = f.hidden_field :noteable_id
   = f.hidden_field :noteable_type
 
-  - if @note.errors.any?
-    .alert-message.block-message.error
-      - @note.errors.full_messages.each do |msg|
-        %div= msg
-
   .note_text_and_preview.js-toggler-container
     %a.js-note-preview-button.js-toggler-target.turn-on{ href: "javascript:;", data: {title: "Preview", url: preview_project_notes_path(@project)} }
       %i.icon-eye-open

app/views/notes/_form_errors.html.haml

@@ -0,0 +1,3 @@
+.error_message.js-errors
+  - note.errors.full_messages.each do |msg|
+    %div= msg

app/views/notes/create.js.haml

@@ -7,10 +7,15 @@
     - else
       NoteList.appendNewNote(#{@note.id}, noteHtml);
   - else
-    var firstDiscussionNoteHtml = "#{escape_javascript(render "notes/diff_notes_with_reply", notes: [@note])}";
-    NoteList.appendNewDiscussionNote("#{@note.discussion_id}", firstDiscussionNoteHtml, noteHtml);
+    :plain
+      var firstDiscussionNoteHtml = "#{escape_javascript(render "notes/diff_notes_with_reply", notes: [@note])}";
+      NoteList.appendNewDiscussionNote("#{@note.discussion_id}",
+                                       firstDiscussionNoteHtml,
+                                       noteHtml);
 
 - else
-  -# TODO: insert form correctly
-  $(".js-main-target-note").replaceWith("#{escape_javascript(render 'notes/common_form')}");
-  GitLab.GfmAutoComplete.setup();
+  var errorsHtml = "#{escape_javascript(render 'notes/form_errors', note: @note)}";
+  - if note_for_main_target?(@note)
+    NoteList.errorsOnForm(errorsHtml);
+  - else
+    NoteList.errorsOnForm(errorsHtml, "#{@note.discussion_id}");