Function selectLineAt

src/ink/selection.ts:368–380

(
  s: SelectionState,
  screen: Screen,
  row: number,
)

 * line content.
 */
export function selectLineAt(
  s: SelectionState,
  screen: Screen,
  row: number,
): void {
  if (row < 0 || row >= screen.height) return
  const lo = { col: 0, row }
  const hi = { col: screen.width - 1, row }
  s.anchor = lo
  s.focus = hi
  s.isDragging = true
  s.anchorSpan = { lo, hi, kind: 'line' }
}

/**
 * Extend a word/line-mode selection to the word/line at (col, row). The