message: StructureSourceControls: show hierarchy preset is >1 trajectory is selected
diff: @@ -195,12 +195,27 @@ export class StructureSourceControls extends CollapsableControls<{}, StructureSo
  get presetActions() {
  const actions: ActionMenu.Item[] = [];
  const { trajectories } = this.plugin.managers.structure.hierarchy.selection;
  - if (trajectories.length !== 1) return actions;
  + if (trajectories.length === 0) return actions;
  +
  + let providers = this.plugin.builders.structure.hierarchy.getPresets(trajectories[0].cell.obj);
  +
  + if (trajectories.length > 1) {
  + const providerSet = new Set(providers);
  + for (let i = 1; i < trajectories.length; i++) {
  + const providers = this.plugin.builders.structure.hierarchy.getPresets(trajectories[i].cell.obj);
  + const current = new Set(providers);
  +
  + for (const p of providers) {
  + if (!current.has(p)) providerSet.delete(p);
  + }
  + }
  + providers = providers.filter(p => providerSet.has(p));
  + }
  - const providers = this.plugin.builders.structure.hierarchy.getPresets(trajectories[0].cell.obj);
  for (const p of providers) {
  actions.push(ActionMenu.Item(p.display.name, p, { description: p.display.description }));
  }
  +
  return actions;
  }
  