[gtk+] Don't set get_preferred_width_for_height to NULL

[Matthias Clasen <matthiasc src gnome org>]

commit b2397d3d7e1babada20ca2e6d10640e3eb20a7e7
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Oct 29 12:58:24 2010 -0400

    Don't set get_preferred_width_for_height to NULL
    
    The size request machinery expects that it is non-NULL.

 gtk/gtkbbox.c |   43 +++++++++++++++++++++++++++++++++++--------
 1 files changed, 35 insertions(+), 8 deletions(-)
---
diff --git a/gtk/gtkbbox.c b/gtk/gtkbbox.c
index f1531b1..045a3a2 100644
--- a/gtk/gtkbbox.c
+++ b/gtk/gtkbbox.c
@@ -81,12 +81,21 @@ static void gtk_button_box_get_property       (GObject           *object,
                                                guint              prop_id,
                                                GValue            *value,
                                                GParamSpec        *pspec);
-static void gtk_button_box_get_preferred_width  (GtkWidget        *widget,
-                                                 gint             *minimum,
-                                                 gint             *natural);
-static void gtk_button_box_get_preferred_height (GtkWidget        *widget,
-                                                 gint             *minimum,
-                                                 gint             *natural);
+static void gtk_button_box_get_preferred_width            (GtkWidget *widget,
+                                                           gint      *minimum,
+                                                           gint      *natural);
+static void gtk_button_box_get_preferred_height           (GtkWidget *widget,
+                                                           gint      *minimum,
+                                                           gint      *natural);
+static void gtk_button_box_get_preferred_width_for_height (GtkWidget *widget,
+                                                           gint       height,
+                                                           gint      *minimum,
+                                                           gint      *natural);
+static void gtk_button_box_get_preferred_height_for_width (GtkWidget *widget,
+                                                           gint       width,
+                                                           gint      *minimum,
+                                                           gint      *natural);
+
 static void gtk_button_box_size_allocate      (GtkWidget         *widget,
                                                GtkAllocation     *allocation);
 static void gtk_button_box_remove             (GtkContainer      *container,
@@ -126,8 +135,8 @@ gtk_button_box_class_init (GtkButtonBoxClass *class)
 
   widget_class->get_preferred_width = gtk_button_box_get_preferred_width;
   widget_class->get_preferred_height = gtk_button_box_get_preferred_height;
-  widget_class->get_preferred_width_for_height = NULL;
-  widget_class->get_preferred_height_for_width = NULL;
+  widget_class->get_preferred_width_for_height = gtk_button_box_get_preferred_width_for_height;
+  widget_class->get_preferred_height_for_width = gtk_button_box_get_preferred_height_for_width;
   widget_class->size_allocate = gtk_button_box_size_allocate;
 
   container_class->remove = gtk_button_box_remove;
@@ -644,6 +653,24 @@ gtk_button_box_get_preferred_height (GtkWidget *widget,
 }
 
 static void
+gtk_button_box_get_preferred_width_for_height (GtkWidget *widget,
+                                               gint       height,
+                                               gint      *minimum,
+                                               gint      *natural)
+{
+  gtk_button_box_get_preferred_width (widget, minimum, natural);
+}
+
+static void
+gtk_button_box_get_preferred_height_for_width (GtkWidget *widget,
+                                               gint       width,
+                                               gint      *minimum,
+                                               gint      *natural)
+{
+  gtk_button_box_get_preferred_height (widget, minimum, natural);
+}
+
+static void
 gtk_button_box_size_allocate (GtkWidget     *widget,
                               GtkAllocation *allocation)
 {