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style: Allow to share style across elements with similar XBL bindings.

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This commit is contained in:
Emilio Cobos Álvarez 2018-03-07 02:04:56 +01:00
parent af12284b6a
commit c338745b17
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4 changed files with 21 additions and 42 deletions
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18
components/style/sharing/mod.rs
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@ -679,12 +679,14 @@ impl<E: TElement> StyleSharingCache<E> {
return None;
}
// Note that in the XBL case, we should be able to assert that the
// scopes are different, since two elements with different XBL bindings
// need to necessarily have different style (and thus children of them
// would never pass the parent check).
if target.element.style_scope() != candidate.element.style_scope() {
trace!("Miss: Different style scopes");
// If two elements belong to different shadow trees, different rules may
// apply to them, from the respective trees.
//
// Note that we don't need the same for XBL case, since two elements
// with different XBL bindings need to necessarily have different style
// (and thus children of them would never pass the parent check).
if target.element.containing_shadow() != candidate.element.containing_shadow() {
trace!("Miss: Different containing shadow roots");
return None;
}
@ -695,7 +697,9 @@ impl<E: TElement> StyleSharingCache<E> {
// shadow root, they could match different rules, due to the slot being
// assigned to yet another slot in another shadow root.
if target.element.assigned_slot() != candidate.element.assigned_slot() {
trace!("Miss: Different style scopes");
// TODO(emilio): We could have a look at whether the shadow roots
// actually have slotted rules and such.
trace!("Miss: Different assigned slots");
return None;
}