Method refresh

src/rough-notation.ts:158–167

()

  private pendingRefresh?: Promise<void>;
  private refresh() {
    if (this.isShowing() && (!this.pendingRefresh)) {
      this.pendingRefresh = Promise.resolve().then(() => {
        if (this.isShowing()) {
          this.show();
        }
        delete this.pendingRefresh;
      });
    }
  }

  show(): void {
    switch (this._state) {