Function getLineStartOffset

src/vim/operators.ts:425–427

* Calculate the offset of a line's start position.

(lines: string[], lineIndex: number)

 * Calculate the offset of a line's start position.
 */
function getLineStartOffset(lines: string[], lineIndex: number): number {
  return lines.slice(0, lineIndex).join('\n').length + (lineIndex > 0 ? 1 : 0)
}

function getOperatorRange(
  cursor: Cursor,