Method subscribeToSelectionChange

src/ink/ink.tsx:1244–1247

* Subscribe to selection state changes. Fires whenever the selection * is started, updated, cleared, or copied. Returns an unsubscribe fn.

(cb: () => void)

   * is started, updated, cleared, or copied. Returns an unsubscribe fn.
   */
  subscribeToSelectionChange(cb: () => void): () => void {
    this.selectionListeners.add(cb);
    return () => this.selectionListeners.delete(cb);
  }
  private notifySelectionChange(): void {
    this.onRender();
    for (const cb of this.selectionListeners) cb();