Function viewportRowToAbsolute

lib/terminal.test.ts:20–24

* Helper to convert viewport row to absolute buffer row for selection tests. * Absolute row = scrollbackLength + viewportRow - viewportY

(term: Terminal, viewportRow: number)

 * Absolute row = scrollbackLength + viewportRow - viewportY
 */
function viewportRowToAbsolute(term: Terminal, viewportRow: number): number {
  const scrollbackLength = term.wasmTerm?.getScrollbackLength() ?? 0;
  const viewportY = Math.floor(term.getViewportY());
  return scrollbackLength + viewportRow - viewportY;
}

/**
 * Helper to set selection using viewport-relative rows (converts to absolute internally)