message: avoid calculating actionItems for isDisabled check
diff: /**
  - * Copyright (c) 2020 mol* contributors, licensed under MIT, See LICENSE file for more info.
  + * Copyright (c) 2020-2022 mol* contributors, licensed under MIT, See LICENSE file for more info.
  *
  * @author Alexander Rose <alexander.rose@weirdbyte.de>
  */
  @@ -118,7 +118,7 @@ export class StructureFocusControls extends PluginUIComponent<{}, StructureFocus
  }
  get isDisabled() {
  - return this.state.isBusy || this.actionItems.length === 0;
  + return this.state.isBusy || this.plugin.managers.structure.hierarchy.selection.structures.length === 0;
  }
  getSelectionItems = memoizeLatest((structures: ReadonlyArray<StructureRef>) => {
  