Not Plotting for open_gerber -follow 1

With the current master branch, on Python2, modules updated (matplotlib 2.2.2), Win10 x64.

When I open a Gerber file with follow parameter True, there is no update on the screen.

After the file parsing, the Gerber object has only a list of LineStrings inside. When the method FlatCAMObj.FlatCAMGerber.plot() (found around line 606) is called (after the signal that object_created is emitted),

        if self.options["solid"]:
            for poly in geometry:
                # TODO: Too many things hardcoded.
                try:
                    patch = PolygonPatch(poly,
                                         facecolor="#BBF268",
                                         edgecolor="#006E20",
                                         alpha=0.75,
                                         zorder=2)
                    self.axes.add_patch(patch)
                except AssertionError:
                    FlatCAMApp.App.log.warning("A geometry component was not a polygon:")
                    FlatCAMApp.App.log.warning(str(poly))

every item in the object geometry list is processed as Exception AssertionError, and the log.warning line looks like this:

[DEBUG][Dummy-1] A new object is available. Should plot it!
[DEBUG][MainThread] on_object_created --> FlatCAMGerber.plot()
[DEBUG][MainThread] plot --> FlatCAMObj.plot()
[WARNING][MainThread] A geometry component was not a polygon:
[WARNING][MainThread] LINESTRING (20.779 24.462, 20.779 27.002, 18.229 27.002, 14.429 27.002)
[WARNING][MainThread] A geometry component was not a polygon:
[WARNING][MainThread] LINESTRING (18.229 27.002, 19.509 27.002, 19.509 28.272)
[WARNING][MainThread] A geometry component was not a polygon:
[WARNING][MainThread] LINESTRING (32.209 14.302, 28.399 14.302, 28.399 16.842)
[WARNING][MainThread] A geometry component was not a polygon:
[WARNING][MainThread] LINESTRING (28.399 14.302, 18.239 14.302)
[WARNING][MainThread] A geometry component was not a polygon:
[WARNING][MainThread] LINESTRING (20.779 16.842, 23.329 16.842, 23.329 28.272, 27.129 28.272)
[WARNING][MainThread] A geometry component was not a polygon:
[WARNING][MainThread] LINESTRING (20.779 19.382, 14.429 19.382)
[WARNING][MainThread] A geometry component was not a polygon:
[WARNING][MainThread] LINESTRING (20.779 21.922, 18.239 21.922)
[WARNING][MainThread] A geometry component was not a polygon:
[WARNING][MainThread] LINESTRING (28.399 21.922, 32.209 21.922)

and those lines are not plotted.

It seems to me that Linestrings are not processed at all. Unfortunately I have no knowledge on how matplotlib works so I post the issue here (instead of solving it).

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