Thin sector selection bug

[CX1]

I found another bug in the doombuilder.
In sector mode, if you have a sector 1-unit width, with all sides flipped inside, you are unable to select it.
Flipping one of long walls outside, solves the problem, but I find it kinda funny.

Here is an example wad with 3 sectors inside:
http://www.ii.uj.edu.pl/~danilews/bug2.wad

[Ultraviolet]

As a temporary work-around, you could work with your sectors bigger and then resize them after your work is done.