Two live defects at cadfba0, each with the repro that showed it and the
fix that answered it: a span places the slot after a collapsed leftover
child a gap early and a gap too long, and a child reused under a parent
that redrew keeps the mask index that parent replaced, so its drawing is
clipped where the subtree used to be. Neither is covered by a test, which
is why the suite is green over both.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
iris-aiandClaude Opus 5
67584cedda