Function normalizeSelection

packages/core/src/widgets/codeEditor.ts:429–441

(
  selection: EditorSelection,
)

 * @returns [start, end] positions
 */
export function normalizeSelection(
  selection: EditorSelection,
): readonly [CursorPosition, CursorPosition] {
  const { anchor, active } = selection;

  if (
    anchor.line < active.line ||
    (anchor.line === active.line && anchor.column <= active.column)
  ) {
    return Object.freeze([anchor, active]);
  }
  return Object.freeze([active, anchor]);
}

/**
 * Get selected text from lines.