* we still include DNS servers from VPNs because of edge cases where the XMPP server is hosted in the VPN
* on older Android versions we don’t know if a network is active or not (activeNetwork == null)

fixes #3465

during live messages we only store the bare real jid; on muc catch up we might get the full jid
for that reason we only compare bare jids

fixes #3475

leave can be triggered on swipe and doesn’t mean we don’t want pushes

when receiving a FCM push message for a channel the user is no longer in (this can happen when the disable command failed) an attempt will be made to explicitly unregister from the app server (which in turn will then send item-not-found on next push)