forked from 1b-agent/opencadstudio-upstream
Center and Quadrant found nothing on a polyline's bulge segments: the lightweight and heavy polylines carried no snap points for them, and a polyline split into several wires kept its points on one piece whose box the others' never reached. Each arc segment now carries its centre and quadrants, hovering the segment offers its centre, and a wire's box covers its snap points. Fixes #1640 Co-Authored-By: Claude Opus 5.5 <[email protected]>