TROR visual glitch - 1 sided walls

tror_test.map

I've provided a test map with 3 cases:

1. A house with no windows that looks fine in polymost.
2. A house with windows but 1-sided walls, which one would think would work the same way as case 1, but has some glitches.
3. A house with windows you can see through both directions, which has worse glitches.

Could the TROR algorithm be tweaked so that at least case 2 is glitch-free like case 1?