Posted by tetukowski on Feb 07, 2022; 10:38am
URL: https://forum.librecad.org/how-to-check-if-every-entity-polyline-on-your-drawing-is-closed-and-strange-behaviour-of-creating-pos-tp5721401p5721429.html

Yes, I forgot that polyline doesn't have to be a closed-loop.
Another case is that if we have another line on top of another line,
for example in our square drawing previously, we have a double line in the same position.
The result of the polyline will be not closed and the extra line is "consumed" inside the polyline.
Hopefully, this information will be useful for others.

Thank you for creating this issue on GitHub.
Just curious, is there going to be an update on LibreCAD?
I hope so. If I were a developer I would contribute. Unfortunately, I am just a mech engineer.
LibreCAD is still an indispensable tool, at least, in Linux.
2D CAD drawing seems outdated because of the 3D CAD.
However, in applications where you do manufacturing layer by layer:
- toolpath for milling CNC, laser cutting
- photolithography
There is still a need for 2D CAD.

Thank you.