login() and fetchData() return incomplete promises

[Glandos]

Describe the bug
Calling $auth.login() returns a promise that will resolve right after login, but before the call (and the result) of fetchData.

To Reproduce

• Call await Vue.$auth.login(…)
• Call Vue.$auth.user() right after
• The returned value is null.

https://codepen.io/glandos/pen/YzQNjeB?editors=1112
You can see that loginNotOK follow the pattern of the current code, while loginOK returns the result of the promise.then call.

Expected behavior
login returned promise should resolve when all information are there. Especially, this code should be valid:

await Vue.$auth.login({username, password})
assert Vue.$auth.user() !== null

This is not the case today.

Is this a wanted behavior? Should I opened a PR to fix that?