Fix autosave in noteable discussion.

app/assets/javascripts/diffs/components/diff_line_note_form.vue

 <script>
-import $ from 'jquery';
 import { mapState, mapGetters, mapActions } from 'vuex';
 import createFlash from '~/flash';
 import { s__ } from '~/locale';
 import noteForm from '../../notes/components/note_form.vue';
 import { getNoteFormData } from '../store/utils';
 import autosave from '../../notes/mixins/autosave';
-import { DIFF_NOTE_TYPE, NOTE_TYPE } from '../constants';
+import { DIFF_NOTE_TYPE } from '../constants';
 
 export default {
   components: {
@@ -42,21 +41,21 @@ export default {
   },
   mounted() {
     if (this.isLoggedIn) {
-      const noteableData = this.noteableData;
       const keys = [
-        noteableData.diff_head_sha,
+        this.noteableData.diff_head_sha,
         DIFF_NOTE_TYPE,
-        noteableData.source_project_id,
+        this.noteableData.source_project_id,
         this.line.lineCode,
       ];
 
-      this.initAutoSave(noteableData, keys);
+      this.initAutoSave(this.noteableData, keys);
     }
   },
   methods: {
     ...mapActions('diffs', ['cancelCommentForm']),
     ...mapActions(['saveNote', 'refetchDiscussionById']),
     handleCancelCommentForm() {
+      // eslint-disable-next-line no-alert
       if (!window.confirm('Are you sure you want to cancel creating this comment?')) {
         return;
       }

app/assets/javascripts/notes/components/noteable_discussion.vue

@@ -144,20 +144,18 @@ export default {
       return this.isDiffDiscussion ? '' : 'card discussion-wrapper';
     },
   },
-  mounted() {
+  watch: {
+    isReplying() {
       if (this.isReplying) {
-      this.initAutoSave(this.transformedDiscussion);
-    }
-  },
-  updated() {
-    if (this.isReplying) {
-      if (!this.autosave) {
-        this.initAutoSave(this.transformedDiscussion);
+        this.$nextTick(() => {
+          // Pass an extra key to separate reply and note edit forms
+          this.initAutoSave(this.transformedDiscussion, ['Reply']);
+        });
       } else {
-        this.setAutoSave();
-      }
+        this.autosave.dispose();
       }
     },
+  },
   created() {
     this.resolveDiscussionsSvg = resolveDiscussionsSvg;
     this.nextDiscussionsSvg = nextDiscussionsSvg;
@@ -420,7 +418,8 @@ Please check your network connection and try again.`;
                     :is-editing="false"
                     save-button-title="Comment"
                     @handleFormUpdate="saveReply"
-                    @cancelForm="cancelReplyForm" />
+                    @cancelForm="cancelReplyForm"
+                  />
                   <note-signed-out-widget v-if="!canReply" />
                 </div>
               </div>