Merge lp:~alan-griffiths/miral/fix-1645284 into lp:miral

[Alan Griffiths]

[libmiral] Register ActiveOutputsMonitor with the "display configuration observer registrar" before server init starts

[Gerry Boland (gerboland)]

Ok.
Mir API disappointing to require this in the preinit

review: Approve

=== modified file 'miral/active_outputs.cpp'
--- miral/active_outputs.cpp	2016-11-28 09:19:40 +0000
+++ miral/active_outputs.cpp	2016-11-28 14:52:28 +0000
@@ -107,7 +107,8 @@
 #if MIR_SERVER_VERSION < MIR_VERSION_NUMBER(0, 26, 0)
     server.override_the_display_configuration_report([this]{ return self; });
 #else
-    server.the_display_configuration_observer_registrar()->register_interest(self);
+    server.add_pre_init_callback([this, &server]
+        { server.the_display_configuration_observer_registrar()->register_interest(self); });
 #endif
 }