commit 86e5fe7fb9c48d3d2edcc129926708ac8f504bab
Author: Dino Bollinger <dino.bollinger@gmail.com>
Date:   Sun Sep 3 21:13:08 2023 +0200

    Engine: Fix many cases in which cansee() would fail with TROR
    
    This commit adds a failsafe which corrects the given origin and
    destination sectnums of the "cansee()" function, by checking if
    the corresponding (x,y,z) coordinates are actually contained
    within the given sectors.
    
    The problem with TROR in particular was that the calculation done
    to determine the point of intersection on the TROR layer requires
    the coordinates to be within the given sectnums. Else, cansee()
    would simply return 0, even if there was a clear line of sight.
    
    This should also implicitly fix any other cases where the coordinates
    of the cansee() call do not exactly match up with the given sectnums.

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