[fractal] app: Disable new-login action without network

[Julian Sparber <jsparber src gnome org>]

commit 2b707c94df0df13abbb47c9e0c3572378be8d610
Author: Julian Sparber <julian sparber net>
Date:   Fri Jul 22 21:28:34 2022 +0200

    app: Disable new-login action without network
    
    We only disable the new-login action when there is no network since the
    user may have the homeserver in the local network or internet connection
    dedection may be broken. (currently the case on my system).

 src/application.rs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
---
diff --git a/src/application.rs b/src/application.rs
index 846bff75a..038d6278c 100644
--- a/src/application.rs
+++ b/src/application.rs
@@ -56,6 +56,21 @@ mod imp {
             app.setup_gactions();
             app.setup_accels();
 
+            let monitor = gio::NetworkMonitor::default();
+            monitor.connect_network_changed(clone!(@weak app => move |monitor, _| {
+                app.lookup_action("show-login")
+                    .unwrap()
+                    .downcast::<gio::SimpleAction>()
+                    .unwrap()
+                    .set_enabled(monitor.is_network_available());
+            }));
+
+            app.lookup_action("show-login")
+                .unwrap()
+                .downcast::<gio::SimpleAction>()
+                .unwrap()
+                .set_enabled(monitor.is_network_available());
+
             app.get_main_window().present();
         }