Garbled outline when contour in edge.cuts is not closed

[cof-celldeg]

I made a mistake in my board by not closing the contour correcly (line on the bottom-left corner was ending about 1mm short) and this caused PcbDraw plot (fantastic tool!) to generate a visibly deformed contour and a garbled rendering of the PCB. See attached image. I also included the kicad_pcb file with the malformed contour for testing purposes.

I dont believe any other settings are of importance as simply closing the contour fixed the issue.
This error may be hard to spot in the CAD view (nonzero line width occluding mismatching corners).
It should be easily caugh by code. A textual warning when calling pcbdraw plot with such malformed input would be very helpful.

This is possibly related to #108 but as I am using a rather old stable release of KiCAD (6.0.5) I opened a new issue.

PCBDraw_BugReport.zip

[yaqwsx]

I don't want to pollute PcbDraw with (no-so-well working) heuristics for fixing malformed outline. The most I am willing to do is to refuse to plot such board. In this case, even the 3D viewer of KiCAD refuses to draw the board.