Hatch fills render through the separate HatchModel pipeline, so the
block wire clip never touched them: hatches outside an XCLIP boundary
were still drawn. Clip each hatch boundary loop to the clip polygon
(Sutherland-Hodgman, even-odd islands preserved) when the insert carries
a spatial filter.
Also fix hatches inside the boundary that were never drawn: the hatch
collector exploded each insert only one level, so hatches nested in
sub-blocks were dropped entirely. Walk the full block tree (depth
guarded) so nested hatches render and clip like the rest.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
