With DIMASSOC on, every dimension QDIM added looked up the objects under
its definition points by scanning the whole space, and each dimension
adds an entity, so QDIM over many objects took quadratic time (20,000
lines: 28 s). QDIM now builds the SnapIndex DIMCONTINUE/DIMBASELINE use
(#281) once per call; dimensions are no snap targets, so it stays valid
while QDIM adds them. A call naming more than 100,000 objects, or whose
objects give more than 100,000 distinct points, is refused before
anything is created.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
