Method setAltScreenActive

src/ink/ink.tsx:861–870

* Called by the component on mount/unmount. * Controls cursor.y clamping in the renderer and gates alt-screen-aware * behavior in SIGCONT/resize/unmount handlers. Repaints on change so * the first alt-screen frame (and first main-screen frame on exit) is * a full redraw

(active: boolean, mouseTracking = false)

   * a full redraw with no stale diff state.
   */
  setAltScreenActive(active: boolean, mouseTracking = false): void {
    if (this.altScreenActive === active) return;
    this.altScreenActive = active;
    this.altScreenMouseTracking = active && mouseTracking;
    if (active) {
      this.resetFramesForAltScreen();
    } else {
      this.repaint();
    }
  }
  get isAltScreenActive(): boolean {
    return this.altScreenActive;
  }