[gtk+] expander: Reinstate rtl allocation behavior

[Matthias Clasen <matthiasc src gnome org>]

commit 763daf44208762b80d118182bc5b5f2d6cfafc9c
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Mar 3 21:28:08 2016 -0500

    expander: Reinstate rtl allocation behavior
    
    In rtl mode, we must not just reverse the children,
    but also allocate from the right. Use the newly introduced
    box gadget api to achieve this.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=762945

 gtk/gtkexpander.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkexpander.c b/gtk/gtkexpander.c
index f6cea5c..3f32da4 100644
--- a/gtk/gtkexpander.c
+++ b/gtk/gtkexpander.c
@@ -787,6 +787,9 @@ gtk_expander_direction_changed (GtkWidget        *widget,
   gtk_box_gadget_remove_gadget (GTK_BOX_GADGET (priv->gadget), priv->title_gadget);
   gtk_box_gadget_insert_gadget (GTK_BOX_GADGET (priv->gadget), 0, priv->title_gadget, FALSE, FALSE, align);
 
+  gtk_box_gadget_set_allocate_reverse (GTK_BOX_GADGET (priv->title_gadget),
+                                       gtk_widget_get_direction (widget) == GTK_TEXT_DIR_RTL);
+
   GTK_WIDGET_CLASS (gtk_expander_parent_class)->direction_changed (widget, previous_direction);
 }