message: StateTree: always show remove all button
diff: @@ -167,7 +167,7 @@ export class RemoveAllButton extends PluginUIComponent<{ }> {
  render() {
  const count = this.plugin.state.data.tree.children.get(StateTransform.RootRef).size;
  - if (count < 2) return null;
  - return <IconButton icon='remove' onClick={this.remove} title={'Remove All'} style={{ display: 'inline-block' }} />;
  + if (count === 0) return null;
  + return <IconButton icon='remove' onClick={this.remove} title={'Remove All'} style={{ display: 'inline-block' }} small />;
  }
  }
  