PersistentProperties is in-process, so it carries the surface choice
through a reload and not through a fresh shell. sessiond locks before the
shell exists, so a greetd-started shell adopts a live lock with
Config.ready still false and binds the desktop surface — and
WlSessionLock.surfaceComponent cannot change once active. A lock screen
that will not take your PIN, on the iPhone 7 tonight.
Reads the environment, which answers at construction. Unset behaves
exactly as before, so nothing changes on blueline until it sets it.
bf469c4216