Function visualCursorPosition

src/tui/fullscreen.js:40–55

(str, cursorIdx, maxVisualWidth)

// Compute cursor visual (line, col) from character index into str.
function visualCursorPosition(str, cursorIdx, maxVisualWidth) {
  let line = 0;
  let col = 0;
  let charIdx = 0;
  for (const ch of str) {
    if (charIdx >= cursorIdx) break;
    const w = visualWidth(ch);
    if (col + w > maxVisualWidth) {
      line++;
      col = 0;
    }
    col += w;
    charIdx++;
  }
  return { line, col };
}

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