Method getViewportY

lib/selection-manager.ts:70–76

* Get current viewport Y position (how many lines scrolled into history)

()

   * Get current viewport Y position (how many lines scrolled into history)
   */
  private getViewportY(): number {
    const rawViewportY =
      typeof (this.terminal as any).getViewportY === 'function'
        ? (this.terminal as any).getViewportY()
        : (this.terminal as any).viewportY || 0;
    return Math.max(0, Math.floor(rawViewportY));
  }

  /**
   * Convert viewport row to absolute buffer row