The MirDisplayConfiguration returned on the client can be incorrect - part 2

Assume that a client is not the active session and reconfigures the display.

The server receives a configure_display() request, notes the config the client wants to use and returns the current active display configuration.

Note that it *does not* change the display configuration.

The client caches this "active" configuration and will return it from mir_connection_create_display_config().

If the client later becomes the active session the display is reconfigured according to the request.

But as no notification is sent to any clients (including the one that made the request) the old "active" configuration is still the one returned by mir_connection_create_display_config().

NB this is related to, but a different scenario to lp:1491937