[libdazzle] menus: fix item remove from menu button sections

[Christian Hergert <chergert src gnome org>]

commit 581f886034241ff61437301527cbaf85a81058c2
Author: Christian Hergert <chergert redhat com>
Date:   Fri Sep 1 14:17:00 2017 -0700

    menus: fix item remove from menu button sections

 src/menus/dzl-menu-button-section.c |    5 +++--
 src/menus/dzl-menu-button.c         |    2 +-
 2 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/src/menus/dzl-menu-button-section.c b/src/menus/dzl-menu-button-section.c
index a46a2e6..e72deca 100644
--- a/src/menus/dzl-menu-button-section.c
+++ b/src/menus/dzl-menu-button-section.c
@@ -106,11 +106,12 @@ dzl_menu_button_section_items_changed (DzlMenuButtonSection *self,
 
   for (guint i = 0; i < removed; i++)
     {
-      GtkWidget *child = dzl_box_get_nth_child (self->items_box, i);
+      GtkWidget *child = dzl_box_get_nth_child (self->items_box, position);
+
       gtk_widget_destroy (child);
     }
 
-  for (guint i = position; i < position + added; i++)
+  for (guint i = position; i < (position + added); i++)
     {
       DzlMenuButtonItem *item;
       g_autoptr(GVariant) target = NULL;
diff --git a/src/menus/dzl-menu-button.c b/src/menus/dzl-menu-button.c
index 1d7bd81..f1c2ac3 100644
--- a/src/menus/dzl-menu-button.c
+++ b/src/menus/dzl-menu-button.c
@@ -128,7 +128,7 @@ dzl_menu_button_items_changed (DzlMenuButton *self,
       gtk_widget_destroy (child);
     }
 
-  for (guint i = position; i < position + added; i++)
+  for (guint i = position; i < (position + added); i++)
     {
       g_autofree gchar *label = NULL;
       g_autoptr(GMenuModel) linked_model = NULL;