Function diffRowRemoved

src/ink/screen.ts:1263–1277

* Emit removals for a row that only exists in prev (height shrank). * Cannot skip empty cells — the terminal still has content from the * previous frame that needs to be cleared.

(
  prev: Screen,
  ci: number,
  y: number,
  startX: number,
  endX: number,
  prevCell: Cell,
  cb: DiffCallback,
)

 * previous frame that needs to be cleared.
 */
function diffRowRemoved(
  prev: Screen,
  ci: number,
  y: number,
  startX: number,
  endX: number,
  prevCell: Cell,
  cb: DiffCallback,
): boolean {
  for (let x = startX; x < endX; x++, ci += 2) {
    cellAtCI(prev, ci, prevCell)
    if (cb(x, y, prevCell, undefined)) return true
  }
  return false
}

/**
 * Emit additions for a row that only exists in next (height grew).