A box in pixels is threaded down the draw now rather than composed back up
the move chain, which closes the offer chain breaking at a region node,
makes `Holds::through` an exact preimage, and retires `redraw`'s third ask.
The section that diagnosed the defect becomes the one that states the rule,
with what the plan got wrong recorded beside it: `px` cannot be stored on
`ActiveData`, because a resize that every `Holds` admits redraws nothing and
would leave it stale everywhere.
`AGREE_STEPS` stays 2, measured rather than assumed: one step passes the
100-seed oracle and fails the 400-seed shrinker on `resize-size` by
0.002 px, so the second step belongs to the resize path re-expressing a part
as a fraction of a box that changed length.
The review of that change found an older defect of its own -- a `Masked`
widget settled on its own panicked, since `redraw` handed it its own mask as
the one it inherited -- and the invariant that closes it is here too.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
iris-aiandClaude Opus 5
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