lexical: fix custom emojis (add a text representation of them)

src/features/compose/editor/nodes/emoji-node.tsx

@@ -61,8 +61,7 @@ class EmojiNode extends DecoratorNode<JSX.Element> {
   }
 
   static importJSON(serializedNode: SerializedEmojiNode): EmojiNode {
-    const { name, src } =
-      serializedNode;
+    const { name, src } = serializedNode;
     const node = $createEmojiNode(name, src);
     return node;
   }
@@ -84,6 +83,10 @@ class EmojiNode extends DecoratorNode<JSX.Element> {
     return true;
   }
 
+  getTextContent(): string {
+    return this.__name;
+  }
+
   decorate(): JSX.Element {
     return (
       <Emoji src={this.__src} alt={this.__name} className='emojione h-4 w-4' />