diff -pru dillo/src/dw_gtk_viewport.c dillo2/src/dw_gtk_viewport.c
--- dillo/src/dw_gtk_viewport.c	Sat May 22 01:42:14 2004
+++ dillo2/src/dw_gtk_viewport.c	Mon May 31 14:59:37 2004
@@ -35,6 +35,8 @@ static void Dw_gtk_viewport_class_init  
 static void Dw_gtk_viewport_destroy       (GtkObject *object);
 
 /* GtkWidget methods */
+static void Dw_gtk_viewport_size_allocate (GtkWidget *widget,
+                                           GtkAllocation *allocation);
 static void Dw_gtk_viewport_realize       (GtkWidget *widget);
 static void Dw_gtk_viewport_unrealize     (GtkWidget *widget);
 static void Dw_gtk_viewport_draw          (GtkWidget *widget,
@@ -160,6 +162,7 @@ static void Dw_gtk_viewport_class_init (
 
    object_class->destroy = Dw_gtk_viewport_destroy;
 
+   widget_class->size_allocate = Dw_gtk_viewport_size_allocate;
    widget_class->realize = Dw_gtk_viewport_realize;
    widget_class->unrealize = Dw_gtk_viewport_unrealize;
    widget_class->draw = Dw_gtk_viewport_draw;
@@ -223,6 +226,19 @@ static void Dw_gtk_viewport_destroy (Gtk
  *  GtkWidget methods  *
  *                     *
  ***********************/
+
+/*
+ * Standard Gtk+ function
+ */
+static void Dw_gtk_viewport_size_allocate (GtkWidget *widget,
+                                           GtkAllocation *allocation)
+{
+   GTK_WIDGET_CLASS(parent_class)->size_allocate (widget, allocation);
+
+   /* gtk_layout_size_allocate() sets them to different values. */
+   GTK_LAYOUT(widget)->hadjustment->page_increment = allocation->width;
+   GTK_LAYOUT(widget)->vadjustment->page_increment = allocation->height;
+}
 
 /*
  * Standard Gtk+ function