bdb07fa5aca84cf6d092607e0e9d42f4bfeaa200
Instead of always letting logind guess what the caller's session is, let's give it the value from $XDG_SESSION_ID when it is present in the caller's environment. Nowadays terminal emulators are often running as services under systemd --user, and not as part of an actual session, so all loginctl calls which depend on logind guessing the session will fail. I don't see a reason not to honour $XDG_SESSION_ID. This applies to LockSession, UnlockSession, TerminateSession, ActivateSession, SetUserLinger. Fixes #6032.
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