Hello,
I came up with this issue while implementing the kivy backend, the problem
is explained in the comments of this issue, but basically according to the
debugging I did, draw_path receives just the paths that are visible so when
zooming for instance on an edge of a bar the number of vertices is not
enough to construct a polygon.
https://github.com/andnovar/kivy/issues/72
Thanks, Andres
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