A position was composed up the slot chain to a normalized region and then
multiplied by the output's size, so the window was the one box in the
system that was not a box. Seeding the chain with a root slot holding it
in pixels makes composing through it leave everything below in pixels,
which is what the multiplication was doing.
`within` already does the arithmetic: a child at `rel` 1 inside a span of
`px` 0 to `px` 1920 composes to `px` 1920 and `rel` 0, so the trailing
`to_px` becomes the identity rather than a step. The shader walks the
same chain and needs no change for the same reason.
This is the shape the resize machinery wants before it can be deleted: a
resize becomes one slot written, which `try_reuse` and `redraws_under`
already carry. Nothing is removed yet.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
iris-aiandClaude Opus 5
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