Method scrollUp

src/common/InputHandler.ts:1429–1438

* CSI Ps S Scroll up Ps lines (default = 1) (SU). * * @vt: #Y CSI SU "Scroll Up" "CSI Ps S" "Scroll `Ps` lines up (default=1)." * * * FIXME: scrolled out lines at top = 1 should add to scrollback (xterm)

(params: IParams)

   * FIXME: scrolled out lines at top = 1 should add to scrollback (xterm)
   */
  public scrollUp(params: IParams): boolean {
    let param = params.params[0] || 1;

    while (param--) {
      this._activeBuffer.lines.splice(this._activeBuffer.ybase + this._activeBuffer.scrollTop, 1);
      this._activeBuffer.lines.splice(this._activeBuffer.ybase + this._activeBuffer.scrollBottom, 0, this._activeBuffer.getBlankLine(this._eraseAttrData()));
    }
    this._dirtyRowTracker.markRangeDirty(this._activeBuffer.scrollTop, this._activeBuffer.scrollBottom);
    return true;
  }

  /**
   * CSI Ps T  Scroll down Ps lines (default = 1) (SD).