Make note posting aware of disabled quick actions

Fixes the issue when we processed quick actions for every note
submission, regardless of whether the note form supported quick actions.

app/assets/javascripts/gl_form.js

@@ -106,4 +106,8 @@ export default class GLForm {
         .removeClass('is-focused');
     });
   }
+
+  get supportsQuickActions() {
+    return Boolean(this.textarea.data('supports-quick-actions'));
+  }
 }

app/assets/javascripts/notes.js

@@ -1617,7 +1617,7 @@ export default class Notes {
     }
 
     tempFormContent = formContent;
-    if (this.hasQuickActions(formContent)) {
+    if (this.glForm.supportsQuickActions && this.hasQuickActions(formContent)) {
       tempFormContent = this.stripQuickActions(formContent);
       hasQuickActions = true;
     }

changelogs/unreleased/25429-fix-disabled-quick-actions-in-notes.yml

+---
+title: Snippet comments where any line begins with a slash following an alphabetic character can't be published
+merge_request: 36563
+type: fixed

spec/frontend/gl_form_spec.js

@@ -111,5 +111,21 @@ describe('GLForm', () => {
         expect(autosize.destroy).not.toHaveBeenCalled();
       });
     });
+
+    describe('supportsQuickActions', () => {
+      it('should return false if textarea does not support quick actions', () => {
+        const glForm = new GLForm(testContext.form, false);
+
+        expect(glForm.supportsQuickActions).toEqual(false);
+      });
+
+      it('should return true if textarea supports quick actions', () => {
+        testContext.textarea.attr('data-supports-quick-actions', true);
+
+        const glForm = new GLForm(testContext.form, false);
+
+        expect(glForm.supportsQuickActions).toEqual(true);
+      });
+    });
   });
 });

spec/frontend/notes/old_notes_spec.js

@@ -624,7 +624,7 @@ describe.skip('Old Notes (~/notes.js)', () => {
     });
   });
 
-  describe('postComment with Slash commands', () => {
+  describe('postComment with quick actions', () => {
     const sampleComment = '/assign @root\n/award :100:';
     const note = {
       commands_changes: {
@@ -640,6 +640,7 @@ describe.skip('Old Notes (~/notes.js)', () => {
     let $notesContainer;
 
     beforeEach(() => {
+      loadFixtures('commit/show.html');
       mockAxios.onPost(NOTES_POST_PATH).reply(200, note);
 
       new Notes('', []);
@@ -659,14 +660,49 @@ describe.skip('Old Notes (~/notes.js)', () => {
       $form.find('textarea.js-note-text').val(sampleComment);
     });
 
-    it('should remove slash command placeholder when comment with slash commands is done posting', done => {
+    it('should remove quick action placeholder when comment with quick actions is done posting', done => {
       jest.spyOn(gl.awardsHandler, 'addAwardToEmojiBar');
       $('.js-comment-button').click();
 
-      expect($notesContainer.find('.system-note.being-posted').length).toEqual(1); // Placeholder shown
+      expect($notesContainer.find('.note.being-posted').length).toEqual(1); // Placeholder shown
 
       setImmediate(() => {
-        expect($notesContainer.find('.system-note.being-posted').length).toEqual(0); // Placeholder removed
+        expect($notesContainer.find('.note.being-posted').length).toEqual(0); // Placeholder removed
+        done();
+      });
+    });
+  });
+
+  describe('postComment with slash when quick actions are not supported', () => {
+    const sampleComment = '/assign @root';
+    let $form;
+    let $notesContainer;
+
+    beforeEach(() => {
+      const note = {
+        id: 1234,
+        html: `<li class="note note-row-1234 timeline-entry" id="note_1234">
+                <div class="note-text">${sampleComment}</div>
+                </li>`,
+        note: sampleComment,
+        valid: true,
+      };
+      mockAxios.onPost(NOTES_POST_PATH).reply(200, note);
+
+      new Notes('', []);
+      $form = $('form.js-main-target-form');
+      $notesContainer = $('ul.main-notes-list');
+      $form.find('textarea.js-note-text').val(sampleComment);
+    });
+
+    it('should show message placeholder including lines starting with slash', done => {
+      $('.js-comment-button').click();
+
+      expect($notesContainer.find('.note.being-posted').length).toEqual(1); // Placeholder shown
+      expect($notesContainer.find('.note-body p').text()).toEqual(sampleComment); // No quick action processing
+
+      setImmediate(() => {
+        expect($notesContainer.find('.note.being-posted').length).toEqual(0); // Placeholder removed
         done();
       });
     });