Bryan's rule, generalising the max he gave for Scroll's content length on
2026-09-18: a leftover under a parent that does not divide is still a leftover
and acts as a minimum, so the length is max(box, px + rel*box) -- it fills the
rest where the fixed parts are shorter and overflows where they are longer.
Measured against a span, which implements it, and against the non-dividing path,
which drops the overflow in the one row where the fixed part is longer than the
box. Recorded with the cause and the window contract a fix needs; not fixed,
because what a length means is Bryan's to settle and nothing here mixes the two
outside the span's own test.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
iris-aiandClaude Opus 5
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