message: Fix tabs switching in SouthPane
diff: @@ -160,8 +160,9 @@ export class SouthPane extends React.PureComponent {
  return (
  <div className="SouthPane" ref={this.southPaneRef}>
  <Tabs
  - defaultActiveKey={this.props.activeSouthPaneTab}
  + activeKey={this.props.activeSouthPaneTab}
  className="SouthPaneTabs"
  + onChange={this.switchTab}
  id={shortid.generate()}
  fullWidth={false}
  >
  