[Bug] Shape builder tool ignores lines and paths with no joined points

As shown here:

2026-10-07.17-57-47.mp4

Any shape that isn't a line works, but when the line intersects the shapes the tool ignores it completely instead of dividing the shape in parts.

Same thing can go for when multiple lines cross and form a closed shape.

Fix #374: Shape Builder cuts regions with open paths and lines

@nyzinux

Thanks for the report and the video, @nyzinux! This should be fixed by #402.

Cutting: the Shape Builder now treats stroke-only lines and open paths as cutting edges. A line across a shape splits it into regions you can merge, or delete with Alt, and lines alone can enclose a region you can fill.
Line pieces: Alt-clicking a piece of a line deletes that piece. Merging across a line removes the piece between the regions.
Filled open paths: these count as closed, as with Illustrator's default "Consider Open Filled Path as Closed".

Gap Detection and the tool's options dialog are still to come. If it still misbehaves for you once this lands, please reopen this issue with an example file. If you're not on our Discord yet, come say hi: https://discord.gg/artcraft

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