Line_Horizon does not take Doom 64-style lights into account

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Lines tagged with the Line_Horizon effect do not take Doom 64-style lighting into account - instead, the extended lighting of Line_Horizon will go off the normal, Doom-style sector lighting.

Easily reproducible in any one-sector map: Set Ceiling/Floor Doom 64-style lighting, then tag your the sector's linedefs with the Line_Horizon effect. The main sector ceiling/floor will be colored, but once it hits the Linedefs, it will use the normal Doom sector lighting (which, by default, is pure white).

You can slightly kludge it (assuming both floor and ceiling don't need different colors) by setting the main sector lighting as well - so long as they're all "the same color," everything will look "right." However, if they're different colors, this is not possible, and it will never look right - one color will wind up "messed with" by the main sector lighting. Setting the main sector lighting color also messes with the Doom 64-style lighting within the sector, throwing it out of whack, so essentially this only "fixes" things if every flat/wall/thing within the sector would be colored the same thing anyway - rendering Doom 64-style lighting moot.

[_mental_]

Fixed in 8ca3427.