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Record narrow_rel_base and the None argument

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iris-ai committed 2026-09-19 16:55:57 -04:00
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@@ -6,10 +6,11 @@ in `docs/LAYOUT_LOG.md`.
## The Iris layout repair is submitted ## The Iris layout repair is submitted
**Iris PR #19** (`layout/one-ask`) replaces closed #18. The tip is `aeb60e5`: **Iris PR #19** (`layout/one-ask`) replaces closed #18. The tip is `beb1386`:
`add6774` fixes collapsed-share placement, retained mask ownership and a `add6774` fixes collapsed-share placement, retained mask ownership and a
redraw-on-reparent defect, `84dad21` removes repeated work in the test redraw-on-reparent defect, `84dad21` removes repeated work in the test
harness, and `5642f20` and `aeb60e5` are the vocabulary and API work below. harness, and `5642f20`, `aeb60e5` and `beb1386` are the vocabulary and API
work below.
The core design remains sound; round-to-nearest is still unchanged. The core design remains sound; round-to-nearest is still unchanged.
Two checkouts share one Git storage. `/home/bob/repos/iris` is the active Two checkouts share one Git storage. `/home/bob/repos/iris` is the active
@@ -50,6 +51,9 @@ had been paid for and ergonomics had not:
- `Painter::place_at` takes the rel base, returns the answer, and draws the - `Painter::place_at` takes the rel base, returns the answer, and draws the
child where there is no answer to re-express. `Span`'s second pass is one child where there is no answer to re-express. `Span`'s second pass is one
call, and its `drawn_across` bookkeeping is gone. call, and its `drawn_across` bookkeeping is gone.
- The rel base a container decides for a child is `narrow_rel_base`, and it
takes `impl Into<Option<[Option<Len>; 2]>>`, so one that narrows nothing
writes `None`. The resolved value stays the bare `rel_base`.
- `Part::All` is a `Part::WHOLE` constant rather than a variant. It was - `Part::All` is a `Part::WHOLE` constant rather than a variant. It was
exactly `Of(UiSpan::FULL)`; measured at 0.07% of instructions retired exactly `Of(UiSpan::FULL)`; measured at 0.07% of instructions retired
against 0.04% run-to-run noise on a 60-seed depth-5 shrink. against 0.04% run-to-run noise on a 60-seed depth-5 shrink.