Method getActiveIds

frontend/lib/src/render-tree/AppRoot.ts:400–412

* Return all active element IDs and block IDs in the tree. * Block IDs are collected from blocks that have a stable identity * (e.g. keyed layout containers), and are needed to prevent * elementStates entries from being garbage-collected.

()

   * elementStates entries from being garbage-collected.
   */
  public getActiveIds(): {
    elements: Set<Element>
    blockIds: Set<string>
  } {
    const visitor = new ElementsSetVisitor()

    this.main.accept(visitor)
    this.sidebar.accept(visitor)
    this.event.accept(visitor)
    this.bottom.accept(visitor)

    return { elements: visitor.elements, blockIds: visitor.blockIds }
  }

  private addElement(
    deltaPath: number[],