If you create a scale with big number of widgets and set value pos to
GTK_POS_TOP or GGTK_POS_BOTTOM, it's value image will be cut. But a scale
with value pos set ot GTK_POS_TOP/BOTTOM will be resized to display all the
value.

Test case.
--------
#include <gtk/gtk.h>

int
main (int argc, char** argv)
{
    
    GtkWidget *window;
    GtkWidget *widget;
    GtkWidget *hbox;

    gtk_init (&argc, &argv);

    widget = gtk_hscale_new (GTK_ADJUSTMENT (gtk_adjustment_new
(1.0,1.0,1.0,1.0,1.0,10.0)));
    gtk_scale_set_digits (GTK_SCALE (widget), 10);
    gtk_scale_set_value_pos (GTK_SCALE (widget), GTK_POS_TOP);

    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
    gtk_container_add (GTK_CONTAINER (window), widget);

    gtk_widget_show_all (window);
    
    gtk_main();
}