[komal0000]

Description

PolylineExtensions.Explode() throws ArgumentOutOfRangeException: The radius must be greater than 0. when a vertex has a bulge but the next vertex is at the same location (a zero-length segment). Explode() decides between a line and an arc only from Bulge, so it calls Arc.CreateFromBulge with two equal points, which produces a zero radius.

This change treats a bulged segment with equal start and end points as a line, the same way a zero-length straight segment is already exploded. @ghostid suggested the same approach in the issue.

Tasks done in this PR

• Something awesome.
• An evil bug have been defeated.
• Code cleanup and maintenance has been done.

Related Issues / Pull Requests

• Fixes PolylineExtensions.Explode() : System.ArgumentOutOfRangeException: The radius must be greater than 0. #1335
• Fix a bulge over a zero-length segment discarding the whole polyline #1229 handles the same degenerate segment in GetPoints() (bounding box). This PR covers Explode() only, so the two don't overlap.

Notes for reviewer

• New test LwPolylineTests.ExplodeBulgeOverZeroLengthSegment fails on master with the exception from the issue and passes with the fix.
• dotnet test src/ACadSharp.Tests -f net9.0: 2489 passed. AddCadObjectStressTest and RemoveCadObjectStressTest fail on my machine with and without this change (timing assertions), so they're unrelated.
• PolyLine.Explode(IPolyline) (internal static) holds a copy of the same loop but has no callers, so I left it alone.
• I used an AI assistant while working on this change. I reviewed the code and tests myself.