A fix for solid midtextures not accounting for texture y offsets properly for non-Lower Unpegged/Peg Midtextured midtextures
A fix for solid midtextures not accounting for "infinite" repeats (Repeat Midtexture + no repeat count set)
A fix for Effect 4 on Polyobject First Line making that particular linedef's midtexture solid in addition to making planes visible - this is not wanted if you want a polyobject with both visible planes and full intangibility. Apparently they never did this anyway, don't mind me \o/