LOW: Generate a Chatname if you recive a chat

[TLTimeplex]

Is your feature request related to a problem? Please describe.
When you get an invite to chat, the name witch the creator of it gave it is the same as you see it. The proplem is when the chat has 3 or 2 prople in it, the usernames will be used to make the chat name so
A1, A2, A3
A1 makes chat => A2, A3
A2 accepts => A2, A3
A3 accepts => A2, A3

Describe the solution you'd like
To fix it the name shoud be regenerted once the invite was accepted so that A2 => A1, A3 and A3 => A1, A2 is the new name

Describe alternatives you've considered
Remove the generated name and let the owner set a chat name