window with GDK_HINT_RESIZE_INC will stupid resize.

#include <gtk/gtk.h>
int main()
{
    gtk_init(NULL, NULL);
    GdkGeometry geometry = {
        0, 0,
        G_MAXINT, G_MAXINT,
        0, 0,
        2, 0,-
        21.0, 21.0,-
        GDK_GRAVITY_NORTH_WEST};
    GdkWindowHints hints = GDK_HINT_RESIZE_INC;
    GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_window_set_default_size(GTK_WINDOW(window), 400, 500);
    gtk_window_set_geometry_hints(GTK_WINDOW(window), window, &geometry, hints);
    gtk_widget_show(window);
    gtk_main();
    return 0;
}

run this code, and resize the window a little.
Then the window will be auto resize to an very small size.