DXF files can contain degenerate arcs where start angle equals end angle
(zero sweep), often left as construction artifacts by CAD software.
These create spurious shapes in ShapeBuilder — e.g. SULLYS-033.dxf
showed 5 loops instead of 4 (3 cutouts + perimeter).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Extract MText and TextEntity from the CadDocument during DXF import
and render them in the EntityView. Handles text alignment (left/center/
right via InsertPoint vs AlignmentPoint) and replaces AutoCAD control
codes (%%p → ±, %%d → °, %%c → ⌀). MText formatting codes are
stripped before display.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Drop CadImportResult.Document: no caller reads it after the
migrations (BendDetectorRegistry runs inside CadImporter.Import
itself, and downstream callers only consume the entity/bend data).
- Drop dead CadConverterForm.GetNextColor() helper: zero callers
since GetDrawings stopped needing it.
- Drop stale 'using OpenNest.Properties;' and unused 'newItems'
local in OnSplitClicked.
- Add Import_WhenNamedDetectorDoesNotExist_ReturnsEmptyBends to
cover the previously untested named-detector branch in
CadImporter.Import.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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