Ajout de nouveaux membres aux discussions privées

[Lilly]

cela a été demandé plusieurs fois et est discuté ici

Add a user to existing personal chat

It would be really helpful to be able to add a user to an existing personal chat thread, as per WhatsApp. This would be the ideal place to plonk it (apologies @JammyDodger): [Screenshot 2022-10-07 11.01.10] The main use case is for a psuedo-chat channel (in our case for most of the moderators) which we wish to add to or subtract from occasionally. It would also be nice to have it for personal chat when you need to pull in a third or fourth person for a time. The challenge of course would b…