Function getViewportLineContent

lib/terminal.test.ts:1665–1675

* Helper to get line content directly from viewport

(term: Terminal, y: number)

   * Helper to get line content directly from viewport
   */
  function getViewportLineContent(term: Terminal, y: number): string {
    const viewport = term.wasmTerm?.getViewport();
    if (!viewport) return '';
    const cols = term.cols;
    const start = y * cols;
    return viewport
      .slice(start, start + cols)
      .map((c) => String.fromCodePoint(c.codepoint || 32))
      .join('')
      .trimEnd();
  }

  test('BUG REPRO: getLine and getViewport should return same data after partial updates', async () => {
    const term = await createIsolatedTerminal({ cols: 80, rows: 24 });