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style: Support multiple parts in ::part() selectors.

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Differential Revision: https://phabricator.services.mozilla.com/D48753
This commit is contained in:
Emilio Cobos Álvarez 2019-10-17 00:51:54 +00:00
parent f701192e38
commit 7965ddefa6
3 changed files with 30 additions and 15 deletions
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10
components/style/stylist.rs
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@ -2032,11 +2032,17 @@ impl CascadeData {
// Part is special, since given it doesn't have any
// selectors inside, it's not worth using a whole
// SelectorMap for it.
if let Some(part) = selector.part() {
if let Some(parts) = selector.parts() {
// ::part() has all semantics, so we just need to
// put any of them in the selector map.
//
// We choose the last one quite arbitrarily,
// expecting it's slightly more likely to be more
// specific.
self.part_rules
.get_or_insert_with(|| Box::new(Default::default()))
.for_insertion(pseudo_element)
.try_entry(part.clone())?
.try_entry(parts.last().unwrap().clone())?
.or_insert_with(SmallVec::new)
.try_push(rule)?;
} else {