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Don't traverse elements that have no style data in animation-only restyle.

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Animation-only restyle only works with elements that have already been styled.
This commit is contained in:
Hiroyuki Ikezoe 2017-06-19 14:55:57 +09:00
parent 9b166c5cda
commit 028c0e4a43
1 changed files with 11 additions and 4 deletions
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15
components/style/traversal.rs
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@ -326,14 +326,21 @@ pub trait DomTraversal<E: TElement> : Sync {
// the element if the element has animation only dirty
// descendants bit, animation-only restyle hint or recascade.
if traversal_flags.for_animation_only() {
if el.has_animation_only_dirty_descendants() {
return true;
}
// Skip elements that have no style data since animation-only
// restyle is not necessary for the elements.
let data = match el.borrow_data() {
Some(d) => d,
None => return false,
};
if !data.has_styles() {
return false;
}
if el.has_animation_only_dirty_descendants() {
return true;
}
return data.restyle.hint.has_animation_hint() ||
data.restyle.hint.has_recascade_self();
}