[libdazzle] menus: hide separator for empty sections

[Christian Hergert <chergert src gnome org>]

commit 461ff77fc448c37b922a1c73e5e480c1c67e7c90
Author: Christian Hergert <chergert redhat com>
Date:   Thu Sep 20 14:22:14 2018 -0700

    menus: hide separator for empty sections

 src/menus/dzl-menu-button-section.c | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/src/menus/dzl-menu-button-section.c b/src/menus/dzl-menu-button-section.c
index d1e74ba..03ab722 100644
--- a/src/menus/dzl-menu-button-section.c
+++ b/src/menus/dzl-menu-button-section.c
@@ -37,6 +37,7 @@ struct _DzlMenuButtonSection
   /* Template references */
   GtkLabel       *label;
   DzlBox         *items_box;
+  GtkSeparator   *separator;
 
   guint           show_accels : 1;
   guint           show_icons : 1;
@@ -152,6 +153,11 @@ dzl_menu_button_section_items_changed (DzlMenuButtonSection *self,
                                          "position", i,
                                          NULL);
     }
+
+  if (added || g_menu_model_get_n_items (menu))
+    gtk_widget_show (GTK_WIDGET (self->separator));
+  else
+    gtk_widget_hide (GTK_WIDGET (self->separator));
 }
 
 static void
@@ -287,6 +293,7 @@ dzl_menu_button_section_class_init (DzlMenuButtonSectionClass *klass)
                                                "/org/gnome/dazzle/ui/dzl-menu-button-section.ui");
   gtk_widget_class_bind_template_child (widget_class, DzlMenuButtonSection, label);
   gtk_widget_class_bind_template_child (widget_class, DzlMenuButtonSection, items_box);
+  gtk_widget_class_bind_template_child (widget_class, DzlMenuButtonSection, separator);
 }
 
 static void