Ensure PersistedElement are unmounted on application logout

src/components/structures/MatrixChat.tsx

@@ -586,6 +586,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
                 break;
             case 'logout':
                 dis.dispatch({action: "hangup_all"});
+                dis.dispatch({action: "logout"});
                 Lifecycle.logout();
                 break;
             case 'require_registration':

src/components/views/elements/PersistedElement.js

@@ -139,6 +139,8 @@ export default class PersistedElement extends React.Component {
     _onAction(payload) {
         if (payload.action === 'timeline_resize') {
             this._repositionChild();
+        } else if (payload.action === 'logout') {
+            PersistedElement.destroyElement(this.props.persistKey);
         }
     }