Sets the cursor theme from which the images for cursor should be taken. If the windowing system supports it, existing cursors created with gdk_cursor_new(), gdk_cursor_new_for_display() and gdk_cursor_new_from_name() are updated to reflect the theme change. Custom cursors constructed with gdk_cursor_new_from_pixbuf() will have to be handled by the application (GTK+ applications can learn about cursor theme changes by listening for change notification for the corresponding #GtkSetting). a #GdkDisplay the name of the cursor theme to use, or %NULL to unset a previously set value the cursor size to use, or 0 to keep the previous size