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layout: Implement the fit-content() sizing function (#36056)

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Spec: https://drafts.csswg.org/css-sizing-3/#funcdef-width-fit-content

It's similar to the `fit-content` keyword but, instead of clamping the
stretch size between `min-content` and `max-content`, it clamps the
provided argument.

So now that we support `fit-content`, it's quite straightforward to add.
It's just not completely clear what should happen when the argument has
a cyclic percentage, so this may need some further adjustments depending
on the outcome of https://github.com/w3c/csswg-drafts/issues/11805

Signed-off-by: Oriol Brufau <obrufau@igalia.com>
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Oriol Brufau 2025-03-23 15:26:44 +01:00 • committed by GitHub
parent 3a356ffb74
commit 8c2ac88ad0
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33 changed files with 100 additions and 192 deletions
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20
components/layout_2020/style_ext.rs
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@ -1014,18 +1014,16 @@ impl LayoutStyle<'_> {
depends_on_block_constraints(&max_size.block) ||
style.depends_on_block_constraints_due_to_relative_positioning(writing_mode);
let box_size = box_size.maybe_percentages_relative_to_basis(&containing_block.size);
let content_box_size = style
.content_box_size_for_box_size(box_size, &pbm)
.map(|v| v.map(Au::from));
let box_size = box_size.map_with(&containing_block.size, |size, basis| {
size.resolve_percentages_for_preferred(*basis)
});
let content_box_size = style.content_box_size_for_box_size(box_size, &pbm);
let min_size = min_size.percentages_relative_to_basis(&containing_block_size_or_zero);
let content_min_box_size = style
.content_min_box_size_for_min_size(min_size, &pbm)
.map(|v| v.map(Au::from));
let max_size = max_size.maybe_percentages_relative_to_basis(&containing_block.size);
let content_max_box_size = style
.content_max_box_size_for_max_size(max_size, &pbm)
.map(|v| v.map(Au::from));
let content_min_box_size = style.content_min_box_size_for_min_size(min_size, &pbm);
let max_size = max_size.map_with(&containing_block.size, |size, basis| {
size.resolve_percentages_for_max(*basis)
});
let content_max_box_size = style.content_max_box_size_for_max_size(max_size, &pbm);
ContentBoxSizesAndPBM {
content_box_sizes: LogicalVec2 {
block: Sizes::new(