Lockscreen multiscreen behavior

[David Kahles]

Hello,
I want to hear some opinions about the multiscreen behavior of the 
lockscreen.

Currently the lockscreen is displayed on all connected monitors. I would 
prefer if the
lockscreen is displayed only on the primary monitor, as it's done at the 
loginscreen,
because there is no need for multiple instances.
I think this also matches the behavior of other operating 
systems/desktop environments.

What do you think?

David