Colour coding obj broken with non-triangular mesh (minc-toolkit-v2-1.9.15)

[cfhammill]

Forwarding this bug report along. It looks like the colour coding functionality in Display breaks with non-triangular meshes. Can be fixed trivially before-hand with triangulate_polygons

Steps to reproduce:

Download example.obj.gz (attached):
example.obj.gz

gunzip example.obj.gz
Display example.obj

in 3D view observe:

D # Colour Coding
A # Colour Code Objects

Observe: