Set relevant ATK roles

This will help the widgets to be more accessible.

src/hdy-arrows.c

@@ -451,6 +451,7 @@ hdy_arrows_class_init (HdyArrowsClass *klass)
                        (G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
   gtk_widget_class_install_style_property (widget_class, style_properties [STYLE_PROP_THICKNESS]);
 
+  gtk_widget_class_set_accessible_role (widget_class, ATK_ROLE_ARROW);
   gtk_widget_class_set_css_name (widget_class, "hdyarrows");
 }
 

src/hdy-dialer.c

@@ -518,6 +518,7 @@ hdy_dialer_class_init (HdyDialerClass *klass)
   gtk_widget_class_bind_template_child_private (widget_class, HdyDialer, btn_submit);
   gtk_widget_class_bind_template_child_private (widget_class, HdyDialer, btn_del);
 
+  gtk_widget_class_set_accessible_role (widget_class, ATK_ROLE_DIAL);
   gtk_widget_class_set_css_name (widget_class, "hdydialer");
 }
 

src/hdy-leaflet.c

@@ -2845,6 +2845,7 @@ hdy_leaflet_class_init (HdyLeafletClass *klass)
 
   gtk_container_class_install_child_properties (container_class, LAST_CHILD_PROP, child_props);
 
+  gtk_widget_class_set_accessible_role (widget_class, ATK_ROLE_PANEL);
   gtk_widget_class_set_css_name (widget_class, "hdyleaflet");
 }
 

src/hdy-title-bar.c

@@ -188,6 +188,7 @@ hdy_title_bar_class_init (HdyTitleBarClass *klass)
 
   g_object_class_install_properties (object_class, LAST_PROP, props);
 
+  gtk_widget_class_set_accessible_role (widget_class, ATK_ROLE_TITLE_BAR);
   /* Adwaita states it expects a headerbar to be the top-level titlebar widget,
    * so style-wise HdyTitleBar pretends to be one as its role is to be the
    * top-level titlebar widget.