iris-aiandClaude Opus 5
95fb4f962c
`Scroll` reports `LEFTOVER` on both axes because it clips its content to its box: it can neither take less of one nor honestly ask for more. `Masked` is the other widget that clips and was passing its inner's size up, so a mask over something taller than its box asked to be placed at the length it had just cut off. It reports its box now, for the same reason. The `debug_assert` the handoff has been asking for is the one that would have caught both, narrowed to what is actually true: a widget that set a mask this draw has to report inside the box it drew in. Reported as "does not exceed the box" it fires on ordinary overflow instead -- measured, a hundred fuzzer trees produce thousands of them, every one a text too tall for the box it was offered, which is what a text is meant to say. `tests/cases/scroll.rs` has a clipping widget that reports its content, to show the assertion catches it. Checked: fmt, clippy, 104 tests, all five shrinker cases at 300 seeds, 100 generated seeds, five examples byte-identical at 1920x1200. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
19 lines
649 B
Rust
19 lines
649 B
Rust
use crate::prelude::*;
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pub struct Masked {
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pub inner: StrongWidget,
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}
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impl Widget for Masked {
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fn draw(&mut self, painter: &mut Painter) -> Size {
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painter.set_mask(painter.region());
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painter.widget(&self.inner);
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// What it occupies is its box, on both axes, for the reason `Scroll`
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// reports the same: it clips what is inside to that box, so it can
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// neither take less of one nor honestly ask for more. Passing the
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// inner size up instead asks to be placed at a length it does not
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// draw, and the framework would place the drawing it clipped away.
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Size::LEFTOVER
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}
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}
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