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layout: Recreate lazy block size when re-doing layout to avoid floats (#38366)

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Block-level boxes that establish an independent formatting context need
to avoid overlapping floats. If their inline size stretches, then we may
need to lay out multiple times.

The problem was that when trying with a different inline size, the
intrinsic block size can change, but we were using the cached final
block size from the previous attempt.

Testing: Adding new test
Fixes: #38365

Signed-off-by: Oriol Brufau <obrufau@igalia.com>
This commit is contained in:
Oriol Brufau 2025-08-04 10:07:10 -07:00 • committed by GitHub
parent 04ec710e60
commit b01bb462b6
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3 changed files with 51 additions and 8 deletions
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20
components/layout/flow/mod.rs
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@ -1391,14 +1391,16 @@ impl IndependentFormattingContext {
)
};
let lazy_block_size = LazySize::new(
&content_box_sizes.block,
Direction::Block,
Size::FitContent,
Au::zero,
available_block_size,
is_table,
);
let get_lazy_block_size = || {
LazySize::new(
&content_box_sizes.block,
Direction::Block,
Size::FitContent,
Au::zero,
available_block_size,
is_table,
)
};
// The final inline size can depend on the available space, which depends on where
// we are placing the box, since floats reduce the available space.
@ -1414,6 +1416,7 @@ impl IndependentFormattingContext {
// compute it with an available inline space of zero. Then, after layout we can
// compute the block size, and finally place among floats.
let inline_size = inline_size_with_no_available_space;
let lazy_block_size = get_lazy_block_size();
layout = self.layout(
layout_context,
positioning_context,
@ -1479,6 +1482,7 @@ impl IndependentFormattingContext {
// Later we'll check to see if the resulting block size is compatible with the
// placement.
let positioning_context_length = positioning_context.len();
let lazy_block_size = get_lazy_block_size();
layout = self.layout(
layout_context,
positioning_context,