// lexical-rich-text/src/index.ts L371
// now
collapseAtStart(): true {
    const newElement = !this.isEmpty()
      ? $createHeadingNode(this.getTag())
      : $createParagraphNode();
    const children = this.getChildren();
    children.forEach((child) => newElement.append(child));
    this.replace(newElement);
    return true;
  }

// what about this ?
collapseAtStart(): true {
    if (!this.isEmpty()) {
      return true;
    }

    const newElement = $createParagraphNode();
    const children = this.getChildren();
    children.forEach((child) => newElement.append(child));
    this.replace(newElement);
    return true;
  }