463757569a
There's no good reason for waiting for the proxy to be initialized to connect signals. In fact, connecting the signal beforehand ensures that the handler is in place when the proxy fetches the properties, so we don't have to call the handler explicitly. That in turn allows us to rely on the signal parameters to only process changed properties. To achieve that, construct the proxy manually, and then initialize it asynchronously in a Promise. Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2391>