[gtk/a11y-fixes: 3/12] stackswitcher: Use a composite accessible

[Matthias Clasen <matthiasc src gnome org>]

commit 145ccfe1c442de04a013b83a21919d79a2940d8b
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Feb 5 23:06:47 2020 -0500

    stackswitcher: Use a composite accessible
    
    This makes the buttons show up in the a11y tree again.

 gtk/gtkstackswitcher.c | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/gtk/gtkstackswitcher.c b/gtk/gtkstackswitcher.c
index c9d30fecf1..aa4bf7f567 100644
--- a/gtk/gtkstackswitcher.c
+++ b/gtk/gtkstackswitcher.c
@@ -33,6 +33,8 @@
 #include "gtktypebuiltins.h"
 #include "gtkwidgetprivate.h"
 
+#include "a11y/gtkcompositeaccessible.h"
+
 /**
  * SECTION:gtkstackswitcher
  * @Short_description: A controller for GtkStack
@@ -595,6 +597,7 @@ gtk_stack_switcher_class_init (GtkStackSwitcherClass *class)
 
   gtk_widget_class_set_layout_manager_type (widget_class, GTK_TYPE_BOX_LAYOUT);
   gtk_widget_class_set_css_name (widget_class, I_("stackswitcher"));
+  gtk_widget_class_set_accessible_type (widget_class, GTK_TYPE_COMPOSITE_ACCESSIBLE);
 }
 
 /**