When you combine the Peg Midtexture (formerly Effect 3) and Solid Midtexture (formerly Effect 4) flags on a middle texture, it will be rendered in the correct place, but the collision will still be in the old, non-pegged place.
Test map: https://dl.dropboxusercontent.com/u/27962790/peggedsolidmidtexture.wad
Test map: https://dl.dropboxusercontent.com/u/27962790/peggedsolidmidtexture.wad
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