// docs/DESIGN.md "Text stays selectable": a click that ends a text selection does nothing. The
// mouseup of a drag-select fires a click on whatever the drag started in, so a title that opens its
// video on click would play it the moment the reader finished selecting its words to copy them.
// A plain click collapses any selection on mousedown, so a non-empty selection that touches the
// element at click time can only be the one this gesture just made.

/** True when the page's selection is non-empty and starts or ends inside `el`. */
export function endsTextSelection(el: Element): boolean {
  const sel = typeof window === "undefined" ? null : window.getSelection();
  if (!sel || sel.isCollapsed || !sel.toString().trim()) return false;
  return (
    (!!sel.anchorNode && el.contains(sel.anchorNode)) ||
    (!!sel.focusNode && el.contains(sel.focusNode))
  );
}