Playing with scrolling, als fixed redraw

bug in wxGrid (outer regions). You must
    not to maths with update regions within
    an scroll related OnPaint(). Everything
    else is allowed.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@6224 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk1/win_gtk.c

@@ -186,6 +186,9 @@ gtk_pizza_init (GtkPizza *pizza)
     pizza->height = 20;
 
     pizza->bin_window = NULL;
+    
+    pizza->xoffset = 0;
+    pizza->yoffset = 0;
 
     pizza->configure_serial = 0;
     pizza->scroll_x = 0;