Benefits:
- nmc_client_new_async*() allows to set properties on the NMClient
instance before calling g_async_initable_init_async().
It also allows to subscribe to any signals (like NM_CLIENT_DEVICE_ADDED)
before actually iterating the GMainContext. This is a sensible and
supported thing to do!
- nmc_client_new_waitsync() iterates the GMainContext until the (async)
initialization is complete. That is different from synchronous nm_client_new(),
which does not iterate the caller's GMainContext, and hence needs an
internal context to ensure the order of events is honored.
- nmc_client_new_waitsync() always returns the NMClient instance, even
if initialization fails.
That is useful if you need the nm_client_get_context_busy_watcher() instance
to ensure all pending messages are completed.
We have "shared/nm-libnm-core-aux", which is shared code that can be used
by anybody (including libnm-core, src, libnm and clients).
We have "clients/common", which are helper function for clients. But
that implies that the code is inside "clients". I think it would be
useful to have auxiliary code that extends libnm, but is not only
usable by code in "clients". In other words, "shared/nm-libnm-aux"
is a better place than "clients/common", and I think most of the
functionality form "clients/common" should move there.
