Changing GtkBox:fill child property default back to TRUE.

Since Havoc's patches introducing the GtkWidget halign/valign
properties, fill should always be TRUE. If the widget should
not fill its allocated space then it should set the halign or
valign properties for that purpose.

This also consequently fixes bug 634592.

gtk/gtkbox.c

@@ -274,17 +274,13 @@ gtk_box_class_init (GtkBoxClass *class)
    * GtkBox:fill:
    *
    * Whether the child should receive extra space when the parent grows.
-   *
-   * Note that the default value for this property is %FALSE for GtkBox,
-   * but #GtkHBox, #GtkVBox and other subclasses use the old default
-   * of %TRUE.
    */
   gtk_container_class_install_child_property (container_class,
 					      CHILD_PROP_FILL,
 					      g_param_spec_boolean ("fill",
 								    P_("Fill"),
 								    P_("Whether extra space given to the child should be allocated to the child or used as padding"),
-								    FALSE,
+								    TRUE,
 								    GTK_PARAM_READWRITE));
 
   gtk_container_class_install_child_property (container_class,
@@ -1648,7 +1644,7 @@ gtk_box_add (GtkContainer *container,
 
   gtk_box_pack_start (GTK_BOX (container), widget,
                       priv->default_expand,
-                      priv->default_expand,
+                      TRUE,
                       0);
 }