I think it would be good if there was an event that tells you which server is currently active and visible to the client.
I’m currently working on a TS-OBS overlay.
The only way I’ve found to figure out which server I should show, is to look on which server the client’s “hardwareInput” was unmuted the latest, since the non-active server tabs in TS5 usually mute the client’s microphone (“hardwareMute”).
But this is a very strange and unreliable workaround, and I think it would be great if there was an official event that tells you which server is currently active.