When a downstream project was disconnected from the host (e.g. the guest
left the call), `disconnected_from_host_internal` did not clear
`client_subscriptions`. These subscriptions hold entries in the
`Client`'s entity subscription map, so a subsequent
`join_remote_project` with the same project ID would fail with "already
subscribed to entity".
The fix adds `self.client_subscriptions.clear()` to
`disconnected_from_host_internal`, matching what `unshare_internal`
already does for the host side.
Before you mark this PR as ready for review, make sure that you have:
- [x] Added a solid test coverage and/or screenshots from doing manual
testing
- [x] Done a self-review taking into account security and performance
aspects
Release Notes:
- collab: Fix unable to rejoin project bug ("already subscribed to
entity")