(bug): If a user is permanently banned from a group and tries to join it again, they are not notified that they have been permanently banned.

Summary

The "JOIN" button changes to "JOINING" but then quickly changes back to "JOIN". No error message is displayed.

NOTE: The accounts involved are @ satyapriya (banned user) and @ testing567 (moderator).

NOTE: Canary mode is turned on.

Steps to reproduce

(How one can reproduce the issue - this is very important)

Platform information

Windows 10 / Chrome (Version 73.0.3683.86)

What is the current bug behavior?

If a user is permanently banned from a group and tries to join it again, they are not notified that they have been permanently banned. The "JOIN" button changes to "JOINING" but then quickly changes back to "JOIN". No error message is displayed. It seems like a bug and the user will likely be confused.

What is the expected correct behavior?

An error message should be displayed informing the user that they have been permanently banned.

Relevant logs and/or screenshots

https://imgur.com/dQCQ6sV

Possible fixes

(If you can, link to the line of code that might be responsible for the problem)