fix doctest in base.pyx

[sagetrac-wcauchois]

The following doctest from line 757 of base.pyx:

sage: G = tetrahedron(color='red') + tetrahedron(color='yellow') + tetrahedron(color='red', opacity=0.5)
sage: G.texture_set()
set([Texture(texture..., red, ff0000), Texture(texture..., yellow, ffff00), Texture(texture..., red, ff0000)])

will fail sometimes because the order of the elements of the set is not fixed. The attached patch fixes this by outputting first the two red textures, and then the yellow texture.

Component: graphics

Author: Bill Cauchois

Reviewer: Willem Jan Palenstijn

Merged: sage-4.3.1.rc1

Issue created by migration from https://trac.sagemath.org/ticket/7985

[sagetrac-wcauchois]

based on sage 4.3.1.rc0

[wjp]

comment:1

Attachment: fix-annoying-doctest.patch.gz

[wjp]

comment:2

Looks good.

[rlmill]

Merged: sage-4.3.1.rc1

[rlmill]

Reviewer: Willem Jan Palenstijn