session_lock: Add accessor for ExtSessionLockV1
to SessionLocker
#1184
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The compositor can store this, and test if the object is still valid with
DisplayHandle::get_client
. This way the compositor can allow another session lock to be created if the previous client crashed and failed to unlock.Maybe there could be a better API to help with this, but I'm not sure how.
pop-os/cosmic-comp#205 demonstrates how this can be handled.