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style: Plumb layer order through ApplicableDeclarationBlock, and make it have an effect

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Same, I want to land this separately to see if it affects
micro-benchmarks. If so, we might want to pack the layer order
_somewhere_ (though in this case I'm not sure where, tbh).

With this, layer rules should have an effect on the page. There are
a few things missing before being able to enable them:

 * Fix nested layer order in some cases (when parent layers are declared
   out of order, see the previous commit mentioning this).
 * Some kind of OM representation, perhaps.
 * Tests of course, which are coming in bug 1728722 and bug 1727276.

But this should be enough to allow playing with them.

Depends on D124337

Differential Revision: https://phabricator.services.mozilla.com/D124338
This commit is contained in:
Emilio Cobos Álvarez 2023-05-27 06:05:52 +02:00 • committed by Oriol Brufau
parent 93fb8861ae
commit 3dc3fb9412
3 changed files with 10 additions and 5 deletions
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3
components/style/stylist.rs
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@ -2176,6 +2176,7 @@ impl CascadeData {
self.rules_source_order,
CascadeLevel::UANormal,
selector.specificity(),
current_layer_order,
));
continue;
}
@ -2678,7 +2679,7 @@ impl Rule {
level: CascadeLevel,
) -> ApplicableDeclarationBlock {
let source = StyleSource::from_rule(self.style_rule.clone());
ApplicableDeclarationBlock::new(source, self.source_order, level, self.specificity())
ApplicableDeclarationBlock::new(source, self.source_order, level, self.specificity(), self.layer_order)
}
/// Creates a new Rule.