Created attachment 360575 [details] [review]
Wait for org.gnome.mutte.DisplayConfig to be available before relying on it to get the correct window scaling.

Review of attachment 360575 [details] [review]:

thank you for the patch, we do indeed have a race with mutter starting up and us calling GetCurrentState from update_xft_settings(). there's a small issue I point out below which I'll fix before pushing as I intend to ship this today for 3.26.1

::: plugins/xsettings/gsd-xsettings-manager.c
@@ +1131,3 @@
+        GnomeXSettingsManager *manager = data;
+
+        g_bus_unwatch_name (manager->priv->display_config_watch_id);

not a big issue in practice, but this means that if gnome-shell/mutter restarts we won't go through update_xft_settings() and pick a possibly different scale value

@@ +1135,3 @@
+
+        manager->priv->monitors_changed_id =
+                g_dbus_connection_signal_subscribe (manager->priv->dbus_connection,

the signal subscription works fine before the well known name appears