commit d032a9949f4be84599e042ca223c5377bd7a7e72
Author: Pierre-Loup A. Griffais <git@plagman.net>
Date:   Sat Feb 13 23:54:34 2021 -0800

    Polymer: update sectors if visibility changed.
    
    Bugged since forever and would have floors and ceilings stay put when
    alt-wheeling in mapster.

See https://voidpoint.io/terminx/eduke32 for more details.