From: Antonio Ospite <ao2@ao2.it>
Date: Wed, 27 Jun 2018 18:39:36 +0000 (+0200)
Subject: svg_tetraflexagon_editor: draw also the backface
X-Git-Url: https://git.ao2.it/flexagon-toolkit.git/commitdiff_plain/78c5623632670822b26bac2f2790928db7becdc6?hp=78c5623632670822b26bac2f2790928db7becdc6

svg_tetraflexagon_editor: draw also the backface

One of the faces also have a backface, draw it to make it easier to
visualize how it will look like when folding the flexagon.
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