Merge branch '32888-fix-error-after-missing-note-hash-fragment-in-dom' into 'master'

Fix error thrown with missing note fragment in DOM

Closes #32888

See merge request !11700
Conflicts:
spec/javascripts/merge_request_tabs_spec.js

app/assets/javascripts/merge_request_tabs.js

@@ -285,7 +285,7 @@ import BlobForkSuggestion from './blob/blob_fork_suggestion';
           // Similar to `toggler_behavior` in the discussion tab
           const hash = window.gl.utils.getLocationHash();
           const anchor = hash && $container.find(`[id="${hash}"]`);
-          if (anchor) {
+          if (anchor && anchor.length > 0) {
             const notesContent = anchor.closest('.notes_content');
             const lineType = notesContent.hasClass('new') ? 'new' : 'old';
             notes.toggleDiffNote({

spec/javascripts/merge_request_tabs_spec.js

 /* eslint-disable no-var, comma-dangle, object-shorthand */
+/* global Notes */
+<<<<<<< HEAD
 require('~/merge_request_tabs');
 require('~/commit/pipelines/pipelines_bundle.js');
 require('~/breakpoints');
@@ -8,6 +10,17 @@ require('~/diff');
 require('~/single_file_diff');
 require('~/files_comment_button');
 require('vendor/jquery.scrollTo');
+=======
+import '~/merge_request_tabs';
+import '~/commit/pipelines/pipelines_bundle';
+import '~/breakpoints';
+import '~/lib/utils/common_utils';
+import '~/diff';
+import '~/single_file_diff';
+import '~/files_comment_button';
+import '~/notes';
+import 'vendor/jquery.scrollTo';
+>>>>>>> a59165e... Merge branch '32888-fix-error-after-missing-note-hash-fragment-in-dom' into 'master'
 (function () {
   // TODO: remove this hack!
@@ -29,7 +42,7 @@ require('vendor/jquery.scrollTo');
       };
       $.extend(stubLocation, defaults, stubs || {});
     };
-    preloadFixtures('merge_requests/merge_request_with_task_list.html.raw');
+    preloadFixtures('merge_requests/merge_request_with_task_list.html.raw', 'merge_requests/diff_comment.html.raw');
     beforeEach(function () {
       this.class = new gl.MergeRequestTabs({ stubLocation: stubLocation });
@@ -286,8 +299,49 @@ require('vendor/jquery.scrollTo');
         spyOn($, 'ajax').and.callFake(function (options) {
           expect(options.url).toEqual('/foo/bar/merge_requests/1/diffs.json');
         });
+
         this.class.loadDiff('/foo/bar/merge_requests/1/diffs');
       });
+
+      describe('with note fragment hash', () => {
+        beforeEach(() => {
+          loadFixtures('merge_requests/diff_comment.html.raw');
+          spyOn(window.gl.utils, 'getPagePath').and.returnValue('merge_requests');
+          window.notes = new Notes('', []);
+          spyOn(window.notes, 'toggleDiffNote').and.callThrough();
+        });
+
+        afterEach(() => {
+          delete window.notes;
+        });
+
+        it('should expand and scroll to linked fragment hash #note_xxx', function () {
+          const noteId = 'note_1';
+          spyOn(window.gl.utils, 'getLocationHash').and.returnValue(noteId);
+          spyOn($, 'ajax').and.callFake(function (options) {
+            options.success({ html: `<div id="${noteId}">foo</div>` });
+          });
+
+          this.class.loadDiff('/foo/bar/merge_requests/1/diffs');
+
+          expect(window.notes.toggleDiffNote).toHaveBeenCalledWith({
+            target: jasmine.any(Object),
+            lineType: 'old',
+            forceShow: true,
+          });
+        });
+
+        it('should gracefully ignore non-existant fragment hash', function () {
+          spyOn(window.gl.utils, 'getLocationHash').and.returnValue('note_something-that-does-not-exist');
+          spyOn($, 'ajax').and.callFake(function (options) {
+            options.success({ html: '' });
+          });
+
+          this.class.loadDiff('/foo/bar/merge_requests/1/diffs');
+
+          expect(window.notes.toggleDiffNote).not.toHaveBeenCalled();
+        });
+      });
     });
   });
 }).call(window);