[atomix/wip/gtk3-port] Preview: center preview widget

[Robert Roth <robertroth src gnome org>]

commit f3d03c99e7b32c614136fd81f62b3429ce155e1d
Author: Robert Roth <robert roth off gmail com>
Date:   Tue Jan 13 01:55:26 2015 +0200

    Preview: center preview widget

 src/main.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/main.c b/src/main.c
index 37edb9c..ae2a5a1 100644
--- a/src/main.c
+++ b/src/main.c
@@ -619,6 +619,9 @@ static GtkWidget *create_goal_widget (GtkWidget **fixed)
   gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
   gtk_container_add (GTK_CONTAINER (frame), GTK_WIDGET (*fixed));
 
+  gtk_widget_set_halign (GTK_WIDGET (*fixed), GTK_ALIGN_CENTER);
+  gtk_widget_set_valign (GTK_WIDGET (*fixed), GTK_ALIGN_CENTER);
+
   return frame;
 }