[baobab] Chart: handle leave event

[Stefano Facchini <sfacchini src gnome org>]

commit 417d258c075eca59817a91864144e75c9e9517f5
Author: Stefano Facchini <stefano facchini gmail com>
Date:   Mon Jun 17 23:10:31 2013 +0200

    Chart: handle leave event
    
    Forgotten when porting to vala

 src/baobab-chart.vala |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/src/baobab-chart.vala b/src/baobab-chart.vala
index ce300a6..9b70c56 100644
--- a/src/baobab-chart.vala
+++ b/src/baobab-chart.vala
@@ -276,6 +276,12 @@ namespace Baobab {
             return false;
         }
 
+        public override bool leave_notify_event (Gdk.EventCrossing event) {
+            highlighted_item = null;
+
+            return false;
+        }
+
         unowned List<ChartItem> add_item (uint depth, double rel_start, double rel_size, Gtk.TreeIter iter) {
             string name;
             uint64 size;