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style: Remove dead code in restyle_hints module.

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Emilio Cobos Álvarez 2017-05-21 23:58:40 +02:00
parent e24d96cdd0
commit 5749886336
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32
components/style/restyle_hints.rs
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@ -765,38 +765,6 @@ impl Borrow<SelectorInner<SelectorImpl>> for Dependency {
}
}
/// A similar version of the above, but for pseudo-elements, which only care
/// about the full selector, and need it in order to properly track
/// pseudo-element selector state.
///
/// NOTE(emilio): We could add a `hint` and `sensitivities` field to the
/// `PseudoElementDependency` and stop posting `RESTYLE_DESCENDANTS`s hints if
/// we visited all the pseudo-elements of an element unconditionally as part of
/// the traversal.
///
/// That would allow us to stop posting `RESTYLE_DESCENDANTS` hints for dumb
/// selectors, and storing pseudo dependencies in the element dependency map.
///
/// That would allow us to avoid restyling the element itself when a selector
/// has only changed a pseudo-element's style, too.
///
/// There's no good way to do that right now though, and I think for the
/// foreseeable future we may just want to optimize that `RESTYLE_DESCENDANTS`
/// to become a `RESTYLE_PSEUDO_ELEMENTS` or something like that, in order to at
/// least not restyle the whole subtree.
#[derive(Clone, Debug)]
#[cfg_attr(feature = "servo", derive(HeapSizeOf))]
struct PseudoElementDependency {
#[cfg_attr(feature = "servo", ignore_heap_size_of = "defined in selectors")]
selector: Selector<SelectorImpl>,
}
impl Borrow<SelectorInner<SelectorImpl>> for PseudoElementDependency {
fn borrow(&self) -> &SelectorInner<SelectorImpl> {
&self.selector.inner
}
}
/// The following visitor visits all the simple selectors for a given complex
/// selector, taking care of :not and :any combinators, collecting whether any
/// of them is sensitive to attribute or state changes.