[gtk+] GtkStackSwitcher: center the button child

[Lapo Calamandrei <lapo src gnome org>]

commit 4053ee0cca04502280df24554292d43a205c9f67
Author: Lapo Calamandrei <calamandrei gmail com>
Date:   Wed Jul 16 19:35:29 2014 +0200

    GtkStackSwitcher: center the button child
    
    Set button child halign to GTK_ALIGN_CENTER since I need it to style
    the needs-attention class, see:
    https://bugzilla.gnome.org/show_bug.cgi?id=707153

 gtk/gtkstackswitcher.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkstackswitcher.c b/gtk/gtkstackswitcher.c
index d5b7ef1..418f2fe 100644
--- a/gtk/gtkstackswitcher.c
+++ b/gtk/gtkstackswitcher.c
@@ -137,6 +137,7 @@ rebuild_child (GtkWidget   *self,
 
   if (button_child)
     {
+      gtk_widget_set_halign (GTK_WIDGET (button_child), GTK_ALIGN_CENTER);
       gtk_widget_show_all (button_child);
       gtk_container_add (GTK_CONTAINER (self), button_child);
     }