message: support update of props.initiallyCollapsed in CollapsableControls
diff: /**
  - * Copyright (c) 2018-2019 mol* contributors, licensed under MIT, See LICENSE file for more info.
  + * Copyright (c) 2018-2020 mol* contributors, licensed under MIT, See LICENSE file for more info.
  *
  * @author David Sehnal <david.sehnal@gmail.com>
  * @author Alexander Rose <alexander.rose@weirdbyte.de>
  @@ -83,6 +83,12 @@ export abstract class CollapsableControls<P = {}, S = {}, SS = {}> extends Plugi
  this.setState({ isCollapsed: !this.state.isCollapsed } as (S & CollapsableState))
  }
  + componentDidUpdate(prevProps: P & CollapsableProps) {
  + if(this.props.initiallyCollapsed !== undefined && prevProps.initiallyCollapsed !== this.props.initiallyCollapsed) {
  + this.setState({ isCollapsed: this.props.initiallyCollapsed as any });
  + }
  + }
  +
  protected abstract defaultState(): (S & CollapsableState)
  protected abstract renderControls(): JSX.Element | null
  