Only the yellow square should be displayed
In addition, the normal vector (red arrow) is displayed.
I can confirm, that this behaviour is the same here at my system environment (Windows 8.1). My model changed it's behaviour a few GIT builds ago like Patrick described it.
In my opinion it is not only happening for polygons, the normal vector is also displayed for lines.
I just put isDrawingNormals to false by default and add a condition in
Yes I confirm it was my fault -- and I should have made the simple fix before, but I'm still struggling with the refactoring of the code. Normals are essential to obtain a correct rendering and I needed to display them. Sorry for that. The fix made by Arnaud is ok, but will be reverted some time in the future.
I am happy to see, that now everything works fine again with the latest GIT version and my model (see attached screenshot). Thanks and keep up the good work. Maybe one day I will be able to helpwith issues like that ....