[Users] Gmail account: impossible to delete Drafts, Sent, Queue and Trash folders

[Removed GDPR]

> No, it's not a bug. But you can tell the account to use Gmail provided
> folders and remove later the ones which Claws Mail creates by default.
>
> See account preferences, Advanced page, Folder group.

I have already done that. Yet strangely the 4 folders created by Claws
Mail were there and impossible to delete... until I restarted the
program. After restarting: only the Queue was at the root level and I
could delete it.

Definitely weird (and looks buggy).