[gitg] Fix RTL icon rendering in navigation tree view

[Jesse van den Kieboom <jessevdk src gnome org>]

commit e15b7546c51df7133dd4b8b45ec6a7b9c24cecb5
Author: Jesse van den Kieboom <jessevdk gmail com>
Date:   Sat Jan 4 21:44:57 2014 +0100

    Fix RTL icon rendering in navigation tree view

 gitg/history/gitg-history-navigation.vala |   24 ++++++++++++++++++++++--
 1 files changed, 22 insertions(+), 2 deletions(-)
---
diff --git a/gitg/history/gitg-history-navigation.vala b/gitg/history/gitg-history-navigation.vala
index 436966c..fe92a1a 100644
--- a/gitg/history/gitg-history-navigation.vala
+++ b/gitg/history/gitg-history-navigation.vala
@@ -687,6 +687,8 @@ namespace GitgHistory
                        var stx = widget.get_style_context();
                        ensure_pixbuf(stx);
 
+                       var rtl = (stx.get_state() & Gtk.StateFlags.DIR_RTL) != 0;
+
                        if (d_pixbuf == null)
                        {
                                base.render(ctx, widget, background_area, cell_area, state);
@@ -695,14 +697,32 @@ namespace GitgHistory
                        {
                                // render the text with an additional padding
                                Gdk.Rectangle area = cell_area;
-                               area.x += d_pixbuf.width + 3;
+
+                               if (!rtl)
+                               {
+                                       area.x += d_pixbuf.width + 3;
+                               }
+                               else
+                               {
+                                       area.x -= d_pixbuf.width + 3;
+                               }
 
                                base.render(ctx, widget, background_area, area, state);
 
                                // render the pixbuf
                                int yp = (cell_area.height - d_pixbuf.height) / 2;
+                               int x;
+
+                               if (!rtl)
+                               {
+                                       x = cell_area.x;
+                               }
+                               else
+                               {
+                                       x = cell_area.x + cell_area.width - d_pixbuf.width - 3;
+                               }
 
-                               stx.render_icon(ctx, d_pixbuf, cell_area.x, cell_area.y + yp);
+                               stx.render_icon(ctx, d_pixbuf, x, cell_area.y + yp);
                        }
                }
        }