[baobab] Set button arrow icons according to locale's text direction

[Stefano Facchini <sfacchini src gnome org>]

commit eb58d8c5c1653ed683fae1f1f74cbfdc9cd62307
Author: Yosef Or Boczko <yosefor3 walla com>
Date:   Mon Jun 17 18:55:37 2013 +0300

    Set button arrow icons according to locale's text direction
    
    https://bugzilla.gnome.org/show_bug.cgi?id=702408

 src/baobab-window.vala |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/src/baobab-window.vala b/src/baobab-window.vala
index 79865fd..8cb08b7 100644
--- a/src/baobab-window.vala
+++ b/src/baobab-window.vala
@@ -146,6 +146,13 @@ namespace Baobab {
 
             setup_treeview ();
 
+            var back_button_image = back_button.get_child () as Gtk.Image;
+            if (get_direction () == Gtk.TextDirection.LTR) {
+                back_button_image.icon_name = "go-previous-symbolic";
+            } else {
+                back_button_image.icon_name = "go-previous-rtl-symbolic";
+            }
+
             infobar_close_button.clicked.connect (() => { clear_message (); });
 
             ui_settings = Application.get_ui_settings ();