logout: reload user info after logout, instead of assuming null (#4383)

because the UI doesn't really know about the anonymous user, except from the API

so.. logout would set user to null, going through the codepath that redirects to /login, which would go to github and log in again
instead, reloading the info when in anonymous mode, the user gets set to the anonymous user, with no redirects

Issue: AAH-2726

Author: himdel

CHANGES/2726.misc

@@ -0,0 +1 @@
+logout: reload user info after logout, instead of assuming null

src/loaders/standalone/layout.tsx

@@ -75,7 +75,11 @@ export const StandaloneLayout = ({
       <DropdownItem
         key='logout'
         aria-label={'logout'}
-        onClick={() => ActiveUserAPI.logout().then(() => setUser(null))}
+        onClick={() =>
+          ActiveUserAPI.logout()
+            .then(() => ActiveUserAPI.getUser().catch(() => null))
+            .then((user) => setUser(user))
+        }
       >
         {t`Logout`}
       </DropdownItem>,