Fix "sticky" user popovers

This reverts commit a0ebd5ca, reversing
changes made to 050ba3e6.

Addresses https://gitlab.com/gitlab-org/gitlab/-/issues/358958.

Changelog: fixed

app/assets/javascripts/behaviors/markdown/render_gfm.js

 import $ from 'jquery';
 import syntaxHighlight from '~/syntax_highlight';
+import initUserPopovers from '../../user_popovers';
 import highlightCurrentUser from './highlight_current_user';
 import { renderKroki } from './render_kroki';
 import renderMath from './render_math';
@@ -21,6 +22,7 @@ $.fn.renderGFM = function renderGFM() {
     renderMermaid(this.find('.js-render-mermaid'));
   }
   highlightCurrentUser(this.find('.gfm-project_member').get());
+  initUserPopovers(this.find('.js-user-link').get());
 
   const mrPopoverElements = this.find('.gfm-merge_request').get();
   if (mrPopoverElements.length) {

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

@@ -7,6 +7,8 @@ import TimeAgoTooltip from '~/vue_shared/components/time_ago_tooltip.vue';
 import UserAvatarLink from '~/vue_shared/components/user_avatar/user_avatar_link.vue';
 import glFeatureFlagsMixin from '~/vue_shared/mixins/gl_feature_flags_mixin';
 
+import initUserPopovers from '../../user_popovers';
+
 /**
  * CommitItem
  *
@@ -80,6 +82,11 @@ export default {
       return this.commit.description_html.replace(/^
/, '');
     },
   },
+  created() {
+    this.$nextTick(() => {
+      initUserPopovers(this.$el.querySelectorAll('.js-user-link'));
+    });
+  },
   safeHtmlConfig: {
     ADD_TAGS: ['gl-emoji'],
   },

app/assets/javascripts/members/components/table/members_table.vue

@@ -4,6 +4,7 @@ import { mapState } from 'vuex';
 import MembersTableCell from 'ee_else_ce/members/components/table/members_table_cell.vue';
 import { canOverride, canRemove, canResend, canUpdate } from 'ee_else_ce/members/utils';
 import { mergeUrlParams } from '~/lib/utils/url_utility';
+import initUserPopovers from '~/user_popovers';
 import UserDate from '~/vue_shared/components/user_date.vue';
 import {
   FIELD_KEY_ACTIONS,
@@ -84,6 +85,9 @@ export default {
       return this.tabQueryParamValue === TAB_QUERY_PARAM_VALUES.invite;
     },
   },
+  mounted() {
+    initUserPopovers(this.$el.querySelectorAll('.js-user-link'));
+  },
   methods: {
     hasActionButtons(member) {
       return (

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

@@ -3,6 +3,7 @@ import { mapGetters, mapActions } from 'vuex';
 import highlightCurrentUser from '~/behaviors/markdown/highlight_current_user';
 import createFlash from '~/flash';
 import { __ } from '~/locale';
+import initUserPopovers from '~/user_popovers';
 import TimelineEntryItem from '~/vue_shared/components/notes/timeline_entry_item.vue';
 import OrderedLayout from '~/vue_shared/components/ordered_layout.vue';
 import glFeatureFlagsMixin from '~/vue_shared/mixins/gl_feature_flags_mixin';
@@ -168,6 +169,7 @@ export default {
   updated() {
     this.$nextTick(() => {
       highlightCurrentUser(this.$el.querySelectorAll('.gfm-project_member'));
+      initUserPopovers(this.$el.querySelectorAll('.js-user-link'));
     });
   },
   beforeDestroy() {

app/assets/javascripts/user_popovers.js

@@ -57,35 +57,41 @@ const populateUserInfo = (user) => {
   );
 };
 
-function initPopover(el, user, mountPopover) {
-  const preloadedUserInfo = getPreloadedUserInfo(el.dataset);
+const initializedPopovers = new Map();
+let domObservedForChanges = false;
 
-  Object.assign(user, preloadedUserInfo);
+const addPopoversToModifiedTree = new MutationObserver(() => {
+  const userLinks = document?.querySelectorAll('.js-user-link, .gfm-project_member');
 
-  if (preloadedUserInfo.userId) {
-    populateUserInfo(user);
+  if (userLinks) {
+    addPopovers(userLinks); /* eslint-disable-line no-use-before-define */
+  }
+});
+
+function observeBody() {
+  if (!domObservedForChanges) {
+    addPopoversToModifiedTree.observe(document.body, {
+      subtree: true,
+      childList: true,
+    });
+
+    domObservedForChanges = true;
   }
-  const UserPopoverComponent = Vue.extend(UserPopover);
-  const popoverInstance = new UserPopoverComponent({
-    propsData: {
-      target: el,
-      user,
-    },
-  });
-  mountPopover(popoverInstance);
-  // wait for component to actually mount
-  setTimeout(() => {
-    // trigger an event to force tooltip to show
-    const event = new MouseEvent('mouseenter');
-    event.isSelfTriggered = true;
-    el.dispatchEvent(event);
-  });
 }
 
-function initPopovers(userLinks, mountPopover) {
-  userLinks
-    .filter(({ dataset, user }) => !user && (dataset.user || dataset.userId))
-    .forEach((el) => {
+export default function addPopovers(elements = document.querySelectorAll('.js-user-link')) {
+  const userLinks = Array.from(elements);
+  const UserPopoverComponent = Vue.extend(UserPopover);
+
+  observeBody();
+
+  return userLinks
+    .filter(({ dataset }) => dataset.user || dataset.userId)
+    .map((el) => {
+      if (initializedPopovers.has(el)) {
+        return initializedPopovers.get(el);
+      }
+
       const user = {
         location: null,
         bio: null,
@@ -93,60 +99,31 @@ function initPopovers(userLinks, mountPopover) {
         status: null,
         loaded: false,
       };
-      el.user = user;
-      const init = initPopover.bind(null, el, user, mountPopover);
-      el.addEventListener('mouseenter', init, { once: true });
-      el.addEventListener('mouseenter', ({ target, isSelfTriggered }) => {
-        if (!isSelfTriggered) return;
-        removeTitle(target);
+      const renderedPopover = new UserPopoverComponent({
+        propsData: {
+          target: el,
+          user,
+        },
       });
-      el.addEventListener('mouseleave', ({ target }) => {
-        target.removeAttribute('aria-describedby');
-      });
-    });
-}
 
-const userLinkSelector = 'a.js-user-link, a.gfm-project_member';
+      initializedPopovers.set(el, renderedPopover);
 
-const getUserLinkNodes = (node) => {
-  if (!('matches' in node)) return null;
-  if (node.matches(userLinkSelector)) return [node];
-  return Array.from(node.querySelectorAll(userLinkSelector));
-};
+      renderedPopover.$mount();
 
-let observer;
+      el.addEventListener('mouseenter', ({ target }) => {
+        removeTitle(target);
+        const preloadedUserInfo = getPreloadedUserInfo(target.dataset);
 
-export default function addPopovers(
-  elements = document.querySelectorAll('.js-user-link'),
-  mountPopover = (popoverInstance) => popoverInstance.$mount(),
-) {
-  const userLinks = Array.from(elements);
+        Object.assign(user, preloadedUserInfo);
 
-  initPopovers(userLinks, mountPopover);
-
-  if (!observer) {
-    observer = new MutationObserver((mutationsList) => {
-      const newUserLinks = mutationsList
-        .filter((mutation) => mutation.type === 'childList' && mutation.addedNodes)
-        .reduce((acc, mutation) => {
-          const userLinkNodes = Array.from(mutation.addedNodes)
-            .flatMap(getUserLinkNodes)
-            .filter(Boolean);
-          acc.push(...userLinkNodes);
-          return acc;
-        }, []);
-
-      if (newUserLinks.length !== 0) {
-        initPopovers(newUserLinks, mountPopover);
-      }
-    });
-    observer.observe(document.body, {
-      subtree: true,
-      childList: true,
-    });
+        if (preloadedUserInfo.userId) {
+          populateUserInfo(user);
+        }
+      });
+      el.addEventListener('mouseleave', ({ target }) => {
+        target.removeAttribute('aria-describedby');
+      });
 
-    document.addEventListener('beforeunload', () => {
-      observer.disconnect();
+      return renderedPopover;
     });
-  }
 }

app/assets/javascripts/vue_shared/alert_details/components/alert_details.vue

@@ -18,6 +18,7 @@ import { toggleContainerClasses } from '~/lib/utils/dom_utils';
 import { visitUrl, joinPaths } from '~/lib/utils/url_utility';
 import { s__ } from '~/locale';
 import Tracking from '~/tracking';
+import initUserPopovers from '~/user_popovers';
 import AlertDetailsTable from '~/vue_shared/components/alert_details_table.vue';
 import TimeAgoTooltip from '~/vue_shared/components/time_ago_tooltip.vue';
 import { PAGE_CONFIG, SEVERITY_LEVELS } from '../constants';
@@ -174,6 +175,7 @@ export default {
   updated() {
     this.$nextTick(() => {
       highlightCurrentUser(this.$el.querySelectorAll('.gfm-project_member'));
+      initUserPopovers(this.$el.querySelectorAll('.js-user-link'));
     });
   },
   methods: {

ee/app/assets/javascripts/vulnerabilities/components/footer.vue

@@ -10,6 +10,7 @@ import createFlash from '~/flash';
 import { TYPE_VULNERABILITY } from '~/graphql_shared/constants';
 import { convertToGraphQLId } from '~/graphql_shared/utils';
 import { s__ } from '~/locale';
+import initUserPopovers from '~/user_popovers';
 import glFeatureFlagMixin from '~/vue_shared/mixins/gl_feature_flags_mixin';
 import { normalizeGraphQLNote } from '../helpers';
 import GenericReportSection from './generic_report/report_section.vue';
@@ -116,6 +117,11 @@ export default {
     this.stopPolling();
     this.unbindVisibilityListener();
   },
+  updated() {
+    this.$nextTick(() => {
+      initUserPopovers(this.$el.querySelectorAll('.js-user-link'));
+    });
+  },
   methods: {
     startPolling() {
       if (this.pollInterval) {

ee/spec/frontend/vulnerabilities/footer_spec.js

@@ -18,9 +18,11 @@ import createMockApollo from 'helpers/mock_apollo_helper';
 import { shallowMountExtended } from 'helpers/vue_test_utils_helper';
 import waitForPromises from 'helpers/wait_for_promises';
 import createFlash from '~/flash';
+import initUserPopovers from '~/user_popovers';
 import { addTypenamesToDiscussion, generateNote } from './mock_data';
 
 jest.mock('~/flash');
+jest.mock('~/user_popovers');
 
 Vue.use(VueApollo);
 
@@ -136,6 +138,13 @@ describe('Vulnerability Footer', () => {
       });
     });
 
+    it('calls initUserPopovers when the component is updated', async () => {
+      createWrapper({ queryHandler: discussionsHandler({ discussions: [] }) });
+      expect(initUserPopovers).not.toHaveBeenCalled();
+      await waitForPromises();
+      expect(initUserPopovers).toHaveBeenCalled();
+    });
+
     it('shows an error the discussions could not be retrieved', async () => {
       await createWrapperAndFetchDiscussions({
         errors: [{ message: 'Something went wrong' }],

spec/frontend/diffs/components/commit_item_spec.js

@@ -6,6 +6,8 @@ import Component from '~/diffs/components/commit_item.vue';
 import { getTimeago } from '~/lib/utils/datetime_utility';
 import CommitPipelineStatus from '~/projects/tree/components/commit_pipeline_status_component.vue';
 
+jest.mock('~/user_popovers');
+
 const TEST_AUTHOR_NAME = 'test';
 const TEST_AUTHOR_EMAIL = 'test+test@gitlab.com';
 const TEST_AUTHOR_GRAVATAR = `${TEST_HOST}/avatar/test?s=40`;

spec/frontend/members/components/table/members_table_spec.js

@@ -21,6 +21,7 @@ import {
   BADGE_LABELS_PENDING_OWNER_APPROVAL,
   TAB_QUERY_PARAM_VALUES,
 } from '~/members/constants';
+import * as initUserPopovers from '~/user_popovers';
 import {
   member as memberMock,
   directMember,
@@ -256,6 +257,14 @@ describe('MembersTable', () => {
     });
   });
 
+  it('initializes user popovers when mounted', () => {
+    const initUserPopoversMock = jest.spyOn(initUserPopovers, 'default');
+
+    createComponent();
+
+    expect(initUserPopoversMock).toHaveBeenCalled();
+  });
+
   it('adds QA selector to table', () => {
     createComponent();
 

spec/frontend/notes/components/notes_app_spec.js

@@ -18,6 +18,8 @@ import '~/behaviors/markdown/render_gfm';
 import OrderedLayout from '~/vue_shared/components/ordered_layout.vue';
 import * as mockData from '../mock_data';
 
+jest.mock('~/user_popovers', () => jest.fn());
+
 setTestTimeout(1000);
 
 const TYPE_COMMENT_FORM = 'comment-form';

spec/frontend/user_popovers_spec.js

@@ -18,13 +18,12 @@ describe('User Popovers', () => {
 
     return link;
   };
-  const findPopovers = () => {
-    return Array.from(document.querySelectorAll('[data-testid="user-popover"]'));
-  };
 
   const dummyUser = { name: 'root' };
   const dummyUserStatus = { message: 'active' };
 
+  let popovers;
+
   const triggerEvent = (eventName, el) => {
     const event = new MouseEvent(eventName, {
       bubbles: true,
@@ -46,49 +45,29 @@ describe('User Popovers', () => {
       .spyOn(UsersCache, 'retrieveStatusById')
       .mockImplementation((userId) => userStatusCacheSpy(userId));
 
-    initUserPopovers(document.querySelectorAll(selector), (popoverInstance) => {
-      const mountingRoot = document.createElement('div');
-      document.body.appendChild(mountingRoot);
-      popoverInstance.$mount(mountingRoot);
-    });
+    popovers = initUserPopovers(document.querySelectorAll(selector));
   });
 
-  describe('shows a placeholder popover on hover', () => {
-    let linksWithUsers;
-    beforeEach(() => {
-      linksWithUsers = findFixtureLinks();
-      linksWithUsers.forEach((el) => {
-        triggerEvent('mouseenter', el);
-      });
-    });
+  it('initializes a popover for each user link with a user id', () => {
+    const linksWithUsers = findFixtureLinks();
 
-    it('for initial links', () => {
-      expect(findPopovers().length).toBe(linksWithUsers.length);
-    });
-
-    it('for elements added after initial load', async () => {
-      const addedLinks = [createUserLink(), createUserLink()];
-      addedLinks.forEach((link) => {
-        document.body.appendChild(link);
-      });
+    expect(linksWithUsers.length).toBe(popovers.length);
+  });
 
-      await Promise.resolve();
+  it('adds popovers to user links added to the DOM tree after the initial call', async () => {
+    document.body.appendChild(createUserLink());
+    document.body.appendChild(createUserLink());
 
-      addedLinks.forEach((link) => {
-        triggerEvent('mouseenter', link);
-      });
+    const linksWithUsers = findFixtureLinks();
 
-      expect(findPopovers().length).toBe(linksWithUsers.length + addedLinks.length);
-    });
+    expect(linksWithUsers.length).toBe(popovers.length + 2);
   });
 
   it('does not initialize the user popovers twice for the same element', () => {
-    const [firstUserLink] = findFixtureLinks();
-    triggerEvent('mouseenter', firstUserLink);
-    triggerEvent('mouseleave', firstUserLink);
-    triggerEvent('mouseenter', firstUserLink);
+    const newPopovers = initUserPopovers(document.querySelectorAll(selector));
+    const samePopovers = popovers.every((popover, index) => newPopovers[index] === popover);
 
-    expect(findPopovers().length).toBe(1);
+    expect(samePopovers).toBe(true);
   });
 
   describe('when user link emits mouseenter event', () => {
@@ -107,11 +86,11 @@ describe('User Popovers', () => {
       expect(userLink.dataset.originalTitle).toBeFalsy();
     });
 
-    it('populates popover with preloaded user data', () => {
+    it('populates popovers with preloaded user data', () => {
       const { name, userId, username } = userLink.dataset;
-      const [firstPopover] = findFixtureLinks();
+      const [firstPopover] = popovers;
 
-      expect(firstPopover.user).toEqual(
+      expect(firstPopover.$props.user).toEqual(
         expect.objectContaining({
           name,
           userId,