message: Fix zIndex of peristent apps in miniMode
  Fixes a bug, where the persistent (PiP mode app) is hidden behind another widget in the right panel or a maximised widget.
diff: @@ -508,7 +508,7 @@ export default class AppTile extends React.Component<IProps, IState> {
  // Also wrap the PersistedElement in a div to fix the height, otherwise
  // AppTile's border is in the wrong place
  appTileBody = <div className="mx_AppTile_persistedWrapper">
  - <PersistedElement persistKey={this.persistKey}>
  + <PersistedElement zIndex={this.props.miniMode ? 10 : 9}persistKey={this.persistKey}>
  { appTileBody }
  </PersistedElement>
  </div>;
  