Review follow-up (#3785, CodeRabbit): traps() tried every pair of visible solid paths on each redraw of the live effect and in the panel command, so many separated shapes cost quadratic work that neither the segment cap nor the overlap budget bounds. Each visible part's bounds are now computed once and a sort-and-sweep on x finds the pairs whose bounds come within the trap's reach (the clamped thickness across x, thickness × height/width across y, plus a hair for rounding); only those reach same_color, lighter and trap_band, which rejected the rest by the same bounds test, so the traps and their order are unchanged. Tests: 2,000 separated squares of two colours and one abutting pair give one candidate pair and one trap; the traps of a mixed scene match those of each pair alone, in order.
The Pathfinder panel menu's Trap… (object.pathfinder.trap) and Effect › Pathfinder › Trap… (pathfinder.trap, live on groups) share one geometry (vectorcraft_pathops::trap_band, vectorcraft_effects::trap): Thickness, Height/Width, Tint Reduction, Traps with Process Color and Reverse Traps, plus the effect's Precision and Remove Redundant Points. The panel's Trap is one undo step and groups the traps above the topmost selected object. Behaviour from https://helpx.adobe.com/illustrator/using/trapping.html and https://helpx.adobe.com/illustrator/using/pathfinder-panel-overview.html.
Taha-Mahmoodi