Change custom emoji to be animated when hovering container (#15637)

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/mastodon/features/directory/components/account_card.js

@@ -102,43 +102,32 @@ class AccountCard extends ImmutablePureComponent {
     onMute: PropTypes.func.isRequired,
   };
 
-  _updateEmojis() {
-    const node = this.node;
-
-    if (!node || autoPlayGif) {
+  handleMouseEnter = ({ currentTarget }) => {
+    if (autoPlayGif) {
       return;
     }
 
-    const emojis = node.querySelectorAll('.custom-emoji');
+    const emojis = currentTarget.querySelectorAll('.custom-emoji');
 
     for (var i = 0; i < emojis.length; i++) {
       let emoji = emojis[i];
-      if (emoji.classList.contains('status-emoji')) {
-        continue;
-      }
-      emoji.classList.add('status-emoji');
-
-      emoji.addEventListener('mouseenter', this.handleEmojiMouseEnter, false);
-      emoji.addEventListener('mouseleave', this.handleEmojiMouseLeave, false);
+      emoji.src = emoji.getAttribute('data-original');
     }
   }
 
-  componentDidMount() {
-    this._updateEmojis();
+  handleMouseLeave = ({ currentTarget }) => {
+    if (autoPlayGif) {
+      return;
+    }
+
+    const emojis = currentTarget.querySelectorAll('.custom-emoji');
+
+    for (var i = 0; i < emojis.length; i++) {
+      let emoji = emojis[i];
+      emoji.src = emoji.getAttribute('data-static');
+    }
   }
 
-  componentDidUpdate() {
-    this._updateEmojis();
-  }
-
-  handleEmojiMouseEnter = ({ target }) => {
-    target.src = target.getAttribute('data-original');
-  };
-
-  handleEmojiMouseLeave = ({ target }) => {
-    target.src = target.getAttribute('data-static');
-  };
-
   handleFollow = () => {
     this.props.onFollow(this.props.account);
   };
@@ -151,10 +140,6 @@ class AccountCard extends ImmutablePureComponent {
     this.props.onMute(this.props.account);
   };
 
-  setRef = (c) => {
-    this.node = c;
-  };
-
   render() {
     const { account, intl } = this.props;
 
@@ -239,7 +224,7 @@ class AccountCard extends ImmutablePureComponent {
           </div>
         </div>
 
-        <div className='directory__card__extra' ref={this.setRef}>
+        <div className='directory__card__extra' onMouseEnter={this.handleMouseEnter} onMouseLeave={this.handleMouseLeave}>
           <div
             className='account__header__content translate'
             dangerouslySetInnerHTML={{ __html: account.get('note_emojified') }}