[gl] fix for ListBase (thx to Alexander Schlueter)
[gl] fix for ListBase (thx to Alexander Schlueter)

looooo/netgen,looooo/netgen,live-clones/netgen,looooo/netgen,live-clones/netgen,live-clones/netgen,looooo/netgen,looooo/netgen,live-clones/netgen,live-clones/netgen,live-clones/netgen,looooo/netgen