[simple-scan] Make device combo insenstive while scanning is in progress

[Bartosz <bkosiorek src gnome org>]

commit 9e8871d95c445bd00ac9143bf8bdc31177d10bbe
Author: Robert Ancell <robert ancell canonical com>
Date:   Tue Apr 21 09:54:01 2020 +1200

    Make device combo insenstive while scanning is in progress

 src/app-window.vala | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/app-window.vala b/src/app-window.vala
index 78d304a..0348160 100644
--- a/src/app-window.vala
+++ b/src/app-window.vala
@@ -262,6 +262,7 @@ public class AppWindow : Gtk.ApplicationWindow
             status_secondary_label.set_text (get_selected_device_label ());
             status_secondary_label.visible = false;
             device_combo.visible = true;
+            device_combo.sensitive = true;
         }
         else if (this.missing_driver != null)
         {
@@ -819,6 +820,7 @@ public class AppWindow : Gtk.ApplicationWindow
     {
         status_primary_label.set_text (/* Label shown when scan started */
                                        _("Contacting scanner…"));
+        device_combo.sensitive = false;
         start_scan (get_selected_device (), options);
     }