Every child gets the whole of the stack's box rather than `box_of(size)`,
and `widget_at` does not resolve a rule into a box already chosen from it.
Fixes half a row becoming a quarter, which no oracle can see because warm
and cold shrink alike. Pinned by
`a_stack_sized_by_a_child_does_not_take_that_childs_fraction_twice`.
Not landed. Seed 1091 at depth 4, `shuffle-swap-for-three`, disagrees by
three steps of the grid -- warm 1053.9971 against cold 1054 -- where the
oracle tolerates two. Not a structural divergence: `box_of` was also making
a child's placement exact, by handing it a box of exactly the length it
asked for, and giving it the whole box instead puts a rounding back at each
nesting level. Two nested stacks is three steps. Widening AGREE_STEPS is
not the answer; finding the composition that went from exact to rounded is.
Everything else is green: suite, shrinker at 400 seeds of depth 5, oracle at
1000 seeds of depth 6, and the rest of 2000 seeds at depth 4.
Also carries examples/text.rs's top panel taking the full width.
All three sat in the middle of a box the width of the widest of them, so
left, centred and right were the same picture. `text_align` puts the glyphs
somewhere in the box the text is given, and a text that reports the width of
its own glyphs is given exactly that -- there is nowhere for it to sit.
Declaring `rel(1.0)` on each hands it the row instead. (Bryan, 2026-09-17.)
iris-ai