forked from 1b-agent/opencadstudio-upstream
The end angle subtracted a whole octant less the end offset, so the arc in the ISOCP 9 stopped about 45 degrees short and the glyph shrank to 0.68 of the cap height; clockwise arcs and n = 0 (a full circle) drew nothing. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>