svg_tetraflexagon_editor: draw also the backface
authorAntonio Ospite <ao2@ao2.it>
Wed, 27 Jun 2018 18:39:36 +0000 (20:39 +0200)
committerAntonio Ospite <ao2@ao2.it>
Thu, 28 Jun 2018 14:45:09 +0000 (16:45 +0200)
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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