
This D-Bus property was never been added here, which caused inconsistencies under some scenarios (e.g. coming back from suspend) if some devices were previously paired, since _sync() would then make the bluetooth menu visible unconditially, because of the proxied property evaluating to 'false'. Adding this to the D-Bus interface makes sure that it's no longer undefined and returns the right value, fixing the bug. https://bugzilla.gnome.org/show_bug.cgi?id=789110