Function reorderFolder

static/js/catalog.js:607–617

(draggedId, targetId, before)

}

function reorderFolder(draggedId, targetId, before) {
  if (draggedId === targetId) return;
  const dragged = folders.find((f) => f.id === draggedId);
  const target = folders.find((f) => f.id === targetId);
  if (!dragged || !target) return;
  folders.splice(folders.indexOf(dragged), 1);
  const toIdx = folders.indexOf(target);
  folders.splice(before ? toIdx : toIdx + 1, 0, dragged);
  saveState();
  render();
}

function isFolderDescendant(ancestorId, candidateId) {
  let cur = folders.find((f) => f.id === candidateId);