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style: Ensure to copy over the viewport/font units invalidation bits when reusing reset properties

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Differential Revision: https://phabricator.services.mozilla.com/D127262
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Emilio Cobos Álvarez 2023-05-27 15:56:55 +02:00 • committed by Oriol Brufau
parent f17c42110c
commit 3bf9bf696a
1 changed files with 13 additions and 5 deletions
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18
components/style/properties/cascade.rs
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@ -853,12 +853,20 @@ impl<'a, 'b: 'a> Cascade<'a, 'b> {
// We're using the same reset style as another element, and we'll skip
// applying the relevant properties. So we need to do the relevant
// bookkeeping here to keep these two bits correct.
// bookkeeping here to keep these bits correct.
//
// Note that all the properties involved are non-inherited, so we don't
// need to do anything else other than just copying the bits over.
let reset_props_bits = ComputedValueFlags::HAS_AUTHOR_SPECIFIED_BORDER_BACKGROUND;
builder.add_flags(cached_style.flags & reset_props_bits);
// Note that the border/background properties are non-inherited, so we
// don't need to do anything else other than just copying the bits over.
//
// When using this optimization, we also need to copy whether the old
// style specified viewport units / used font-relative lengths, this one
// would as well. It matches the same rules, so it is the right thing
// to do anyways, even if it's only used on inherited properties.
let bits_to_copy = ComputedValueFlags::HAS_AUTHOR_SPECIFIED_BORDER_BACKGROUND |
ComputedValueFlags::DEPENDS_ON_SELF_FONT_METRICS |
ComputedValueFlags::DEPENDS_ON_INHERITED_FONT_METRICS |
ComputedValueFlags::USES_VIEWPORT_UNITS;
builder.add_flags(cached_style.flags & bits_to_copy);
true
}