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style: relax assertions in dom::element when setting selector flags.

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Fixes #16409
This commit is contained in:
Emilio Cobos Álvarez 2017-04-13 17:32:13 +08:00
parent b514168469
commit 39ab49823b
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2 changed files with 10 additions and 1 deletions
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9
components/style/matching.rs
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@ -930,8 +930,17 @@ pub trait MatchMethods : TElement {
let self_flags = flags.for_self();
if !self_flags.is_empty() {
if element == self {
// If this is the element we're styling, we have exclusive
// access to the element, and thus it's fine inserting them,
// even from the worker.
unsafe { element.set_selector_flags(self_flags); }
} else {
// Otherwise, this element is an ancestor of the current element
// we're styling, and thus multiple children could write to it
// if we did from here.
//
// Instead, we can read them, and post them if necessary as a
// sequential task in order for them to be processed later.
if !element.has_selector_flags(self_flags) {
let task =
SequentialTask::set_selector_flags(element.clone(),