message: Remove special case RHS resizer logic
  It doesn't seem to affect anything by being removed.
diff: @@ -74,25 +74,6 @@ export default class MainSplit extends React.Component {
  }
  }
  - componentDidUpdate(prevProps) {
  - const wasExpanded = !this.props.collapsedRhs && prevProps.collapsedRhs;
  - const wasCollapsed = this.props.collapsedRhs && !prevProps.collapsedRhs;
  - const wasPanelSet = this.props.panel && !prevProps.panel;
  - const wasPanelCleared = !this.props.panel && prevProps.panel;
  -
  - // TODO: TravisR - fix this logic
  -
  - if (this.resizeContainer && (wasExpanded || wasPanelSet)) {
  - // The resizer can only be created when **both** expanded and the panel is
  - // set. Once both are true, the container ref will mount, which is required
  - // for the resizer to work.
  - this._createResizer();
  - } else if (this.resizer && (wasCollapsed || wasPanelCleared)) {
  - this.resizer.detach();
  - this.resizer = null;
  - }
  - }
  -
  render() {
  const bodyView = React.Children.only(this.props.children);
  const panelView = this.props.panel;
  