Function _getOptionScrollPosition

src/material/core/option/option.ts:330–345

(
  optionOffset: number,
  optionHeight: number,
  currentScrollPosition: number,
  panelHeight: number,
)

 * @docs-private
 */
export function _getOptionScrollPosition(
  optionOffset: number,
  optionHeight: number,
  currentScrollPosition: number,
  panelHeight: number,
): number {
  if (optionOffset < currentScrollPosition) {
    return optionOffset;
  }

  if (optionOffset + optionHeight > currentScrollPosition + panelHeight) {
    return Math.max(0, optionOffset - panelHeight + optionHeight);
  }

  return currentScrollPosition;
}