Properly unset the active channel in the server #7919
Merged
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Summary
When we mark a channel as read on the server, the "active channel" gets set. This handles how we receive push notifications.
This PR makes sure we unset the active channel when we exit from the channel screen, or we send the app to the background.
I also piggybacked a fix for channels in other servers being read when they should not.
Ticket Link
Fix https://mattermost.atlassian.net/browse/MM-57000
Release Note