IssueNotesRefactor: Reenable button after failed submit attempt.

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

@@ -73,7 +73,7 @@
             });
         }
       },
-      formUpdateHandler(noteText, parentElement) {
+      formUpdateHandler(noteText, parentElement, callback) {
         const data = {
           endpoint: this.note.path,
           note: {
@@ -94,7 +94,8 @@
             'Something went wrong while editing your comment. Please try again.',
             'alert',
             $(parentElement),
-          ));
+          ))
+          .then(callback);
       },
       formCancelHandler(shouldConfirm, isDirty) {
         if (shouldConfirm && isDirty) {

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

@@ -49,8 +49,8 @@
           });
         }
       },
-      handleFormUpdate(note, parentElement) {
-        this.$emit('handleFormUpdate', note, parentElement);
+      handleFormUpdate(note, parentElement, callback) {
+        this.$emit('handleFormUpdate', note, parentElement, callback);
       },
       formCancelHandler(shouldConfirm, isDirty) {
         this.$emit('cancelFormEdition', shouldConfirm, isDirty);

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

@@ -74,7 +74,10 @@
     methods: {
       handleUpdate() {
         this.isSubmitting = true;
-        this.$emit('handleFormUpdate', this.note, this.$refs.editNoteForm);
+
+        this.$emit('handleFormUpdate', this.note, this.$refs.editNoteForm, () => {
+          this.isSubmitting = false;
+        });
       },
       editMyLastNote() {
         if (this.note === '') {