The default stays the same -- false.
A race could prevent setting ForeignMenu::_active correctly.
That happened when Application::on_app_activated was called before
_foriegn_menu was created. When foriegn_menu was created its
_active defaults to false, and that has not changed, until focus
was taken out and back in spice-client window.
This caused usbrdr to sometimes not auto-share devices, unless
the user switched focus to a different application and back to
spicec.
The fix updates ForiegnMenu::_active upon creation.
Spice foreign menu enables external control of the client menu.
The foreignmenu protocol enables an external application to:
add a submenu, set its title, clear it, add/modify/remove an item etc.
Foreign menu is based on the cross-platform named pipe.
