Hide the length of hidden passwords.
Use cases
Showing the length of hidden passwords gives away valuable information about the password that is (almost) never actually useful to the user. Therefore the length should be hidden by giving the hidden password a fixed length. Many password managers already do this.
Desired behavior
Hide the length of hidden passwords by displaying a fixed amount of dots instead.
Benefits of the solution
This feature would prevent attackers from knowing the length of a password which could be a giveaway for cracking it, especially for shorter passwords.
Possible drawbacks
I don't think the length of a hidden password is ever useful to the user. If this is the case, the benefits of this feature would have to be considered.