Method cursorUp

src/common/InputHandler.ts:902–911

* CSI Ps A * Cursor Up Ps Times (default = 1) (CUU). * * @vt: #Y CSI CUU "Cursor Up" "CSI Ps A" "Move cursor `Ps` times up (default=1)." * If the cursor would pass the top scroll margin, it will stop there.

(params: IParams)

   * If the cursor would pass the top scroll margin, it will stop there.
   */
  public cursorUp(params: IParams): boolean {
    // stop at scrollTop
    const diffToTop = this._activeBuffer.y - this._activeBuffer.scrollTop;
    if (diffToTop >= 0) {
      this._moveCursor(0, -Math.min(diffToTop, params.params[0] || 1));
    } else {
      this._moveCursor(0, -(params.params[0] || 1));
    }
    return true;
  }

  /**
   * CSI Ps B