[gnome-control-center/gnome-3-28] Trigger active_input_update as a workaround in some cases which is reporting things in the wrong ord

[Robert Ancell <rancell src gnome org>]

commit aa4d70d84f188b4fe2a79101a4524a21ed565f5f
Author: hugh chao (hugh712) <hugh chao canonical com>
Date:   Fri Nov 29 13:07:15 2019 +0800

    Trigger active_input_update as a workaround in some cases which is
    reporting things in the wrong order.
    
    https://gitlab.gnome.org/GNOME/gnome-control-center/issues/324

 panels/sound/gvc-mixer-dialog.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/panels/sound/gvc-mixer-dialog.c b/panels/sound/gvc-mixer-dialog.c
index e3e1efcac..009151841 100644
--- a/panels/sound/gvc-mixer-dialog.c
+++ b/panels/sound/gvc-mixer-dialog.c
@@ -1151,6 +1151,9 @@ add_input_ui_entry (GvcMixerDialog *dialog,
                             ICON_COLUMN, icon,
                             ID_COLUMN, gvc_mixer_ui_device_get_id (input),
                             -1);
+
+        if (gtk_tree_model_iter_n_children (model, NULL) == 1)
+                active_input_update (dialog, input);
 }
 
 static void