Gio.DBusInterfaceSkeleton::flush
function vfunc_flush(): void { }
If interface_ has outstanding changes, request for these changes to be emitted immediately.
For example, an exported D-Bus interface may queue up property changes and emit the `org.freedesktop.DBus.Properties::Propert`` signal later (e.g. in an idle handler). This technique is useful for collapsing multiple property changes into one.
Since 2.30