Function patchStreamingHtml

src/patch-streaming-html.ts:585–665

(
  container: HTMLElement,
  displayHtml: string,
  trackClean: string,
  previousTrack: string,
)

 * Returns true if patched in-place, false if caller should full replace.
 */
export function patchStreamingHtml(
  container: HTMLElement,
  displayHtml: string,
  trackClean: string,
  previousTrack: string,
): boolean {
  const track = stripCaret(trackClean);
  if (track === previousTrack) {
    return true;
  }

  const tableStart = findTableStart(track);
  const prevTableStart = findTableStart(previousTrack);

  // Table just started — append prefix then patch the table tail
  if (tableStart !== -1 && prevTableStart === -1) {
    const prefix = track.slice(0, tableStart);
    if (prefix.startsWith(previousTrack) || previousTrack.startsWith(prefix)) {
      if (prefix.length > previousTrack.length) {
        container.insertAdjacentHTML(
          "beforeend",
          prefix.slice(previousTrack.length),
        );
      }
      if (container.querySelector("table")) {
        return patchFirstTableStream(
          container,
          displayHtml,
          track,
          previousTrack,
        );
      }
    }
    return false;
  }

  // Table streaming — append rows instead of replacing the whole table
  if (
    tableStart !== -1 &&
    prevTableStart !== -1 &&
    tableStart === prevTableStart
  ) {
    const prefix = track.slice(0, tableStart);
    const prevPrefix = previousTrack.slice(0, prevTableStart);

    if (prefix === prevPrefix) {
      return patchFirstTableStream(
        container,
        displayHtml,
        track,
        previousTrack,
      );
    }
  }

  // Plain text only — append into open element or container root
  if (
    tableStart === -1 &&