Prevent unexpected behavior when marking shaapes outside playfield.
treec8af11207b73ac9f395964ccde773a2267395afb
-rw-r--r-- 35149 COPYING
drwxr-xr-x - dox
-rw-r--r-- 25348 gbg.bas
drwxr-xr-x - gfx
-rw-r--r-- 7855 menus.bi
drwxr-xr-x - variations