[gitg] Do not change selection mode multiple times

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

commit 5749e87b1790e63629893e0de54ebb6072c84f16
Author: Jesse van den Kieboom <jessevdk gnome org>
Date:   Sun Jul 20 16:30:51 2014 +0300

    Do not change selection mode multiple times

 gitg/gitg-window.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gitg/gitg-window.vala b/gitg/gitg-window.vala
index a87cad1..abf29a0 100644
--- a/gitg/gitg-window.vala
+++ b/gitg/gitg-window.vala
@@ -824,7 +824,7 @@ public class Window : Gtk.ApplicationWindow, GitgExt.Application, Initable
                {
                        var selectable = current_activity as GitgExt.Selectable;
 
-                       if (selectable == null)
+                       if (selectable == null || d_selectable_mode == value)
                        {
                                return;
                        }