core: Allow disabling preferences

debian/vanilla-first-setup.substvars

@@ -0,0 +1,2 @@
+misc:Depends=dconf-gsettings-backend | gsettings-backend
+misc:Pre-Depends=

recipe.json

@@ -59,7 +59,8 @@
                 {
                     "id": "snap",
                     "title": "Snap",
-                    "subtitle": "Manage and configure Snaps and the Snapcraft repository."
+                    "subtitle": "Manage and configure Snaps and the Snapcraft repository.",
+                    "disabled": true
                 },
                 {
                     "id": "appimage",

vanilla_first_setup/layouts/preferences.py

@@ -58,6 +58,11 @@ class VanillaLayoutPreferences(Adw.Bin):
             _switcher.set_valign(Gtk.Align.CENTER)
             _action_row.add_suffix(_switcher)
 
+            if item.get("disabled"):
+                _action_row.set_visible(False)
+                _action_row.set_sensitive(False)
+                _switcher.set_sensitive(False)
+
             self.prefs_list.add(_action_row)
 
             self.__register_widgets.append((item["id"], _switcher))