Fix useLogin should invalidate the getPermissions cache

[slax57]

Problem

Consider an Admin that has some pages that allow anonymous access, and also a authProvider.getPermissions() implementation, that, say, returns 'user' when the user is logged in, and undefined when the user is not logged in.

If the user first accesses the anonymous parts of the Admin, the cached permission will be undefined. But if he then logs in, without leaving the Admin, then the cache is not updated, and the permissions still return undefined instead of 'user'.

Solution

Invalidate the getPermissions cache after a successful login, to force a refetch of the permissions.

How To Test

https://react-admin-storybook-31pnpeyju-marmelab.vercel.app/?path=/story/ra-core-auth-uselogin--permissions-state

Additional Checks

• The PR targets master for a bugfix, or next for a feature
• The PR includes unit tests (if not possible, describe why)
• The PR includes one or several stories (if not possible, describe why)
• The documentation is up to date -> no need, bugfix

Also, please make sure to read the contributing guidelines.

[djhi]

Why use a child function here? You could just return the JSX you have in inspectPermissionsState, couldn't you?

[slax57]

Didn't give it too much though TBH, I just copied that code from the usePermissions stories