[baobab] Chart: reset highlighted item when changing root

[Stefano Facchini <sfacchini src gnome org>]

commit 30c1e494bc56100fa3d8acefb46de8b145f2ac50
Author: Stefano Facchini <stefano facchini gmail com>
Date:   Sun Jun 16 18:03:50 2013 +0200

    Chart: reset highlighted item when changing root

 src/baobab-chart.vala |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/baobab-chart.vala b/src/baobab-chart.vala
index ed55269..f2a75e6 100644
--- a/src/baobab-chart.vala
+++ b/src/baobab-chart.vala
@@ -144,6 +144,8 @@ namespace Baobab {
                 }
                 root_ = (value != null) ? new Gtk.TreeRowReference (model, value) : null;
 
+                highlighted_item = null;
+
                 queue_draw ();
             }
             owned get {