e.show = function () {
  this.$menu.classList.add('active');
};

Menu.prototype.hide = function () {
  this.$menu.classList.remove('active');
};

Menu.prototype.isVisible = function () {
  return this.$menu.classList.contains('active');
};

Menu.prototype.showPins = function () {
  this.$pins.classList.add('active');
};

Menu.prototype.hidePins = function () {
  this.$pins.classList.remove('active');
};

Menu.prototype.addPinEntry = function (id) {
  let entry = this.search.biblio.byId[id];
  if (!entry) {
