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Don't drain ranges across shadow boundaries (#37281)
The [live range pre remove steps](https://dom.spec.whatwg.org/#live-range-pre-remove-steps) state that: > For each [live range](https://dom.spec.whatwg.org/#concept-live-range) whose [start node](https://dom.spec.whatwg.org/#concept-range-start-node) is an [inclusive descendant](https://dom.spec.whatwg.org/#concept-tree-inclusive-descendant) of node, set its [start](https://dom.spec.whatwg.org/#concept-range-start) to (parent, index). Elements in a shadow tree are not inclusive descendants of their hosts - meaning we should not bubble ranges across shadow boundaries. Includes a small fix to `Node::ranges_is_empty` which makes servo do less work on DOM mutations, as well as some changes to `range.rs` to match the spec better. I made these changes during debugging and they don't feel like they're worth their own PR. Testing: Covered by WPT --------- Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>
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3 changed files with 80 additions and 55 deletions
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@ -752,10 +752,9 @@ impl Node {
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}
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pub(crate) fn ranges_is_empty(&self) -> bool {
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match self.rare_data().as_ref() {
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Some(data) => data.ranges.is_empty(),
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None => false,
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}
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self.rare_data()
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.as_ref()
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.is_none_or(|data| data.ranges.is_empty())
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}
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#[inline]
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@ -2665,7 +2664,9 @@ impl Node {
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fn remove(node: &Node, parent: &Node, suppress_observers: SuppressObserver, can_gc: CanGc) {
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parent.owner_doc().add_script_and_layout_blocker();
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// Step 2.
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// Step 1. Let parent be node’s parent.
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// Step 2. Assert: parent is non-null.
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// NOTE: We get parent as an argument instead
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assert!(
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node.GetParentNode()
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.is_some_and(|node_parent| &*node_parent == parent)
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@ -2677,11 +2678,21 @@ impl Node {
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if parent.ranges_is_empty() {
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None
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} else {
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// Step 1.
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// Step 1. Let parent be node’s parent.
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// Step 2. Assert: parent is not null.
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// NOTE: We already have the parent.
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// Step 3. Let index be node’s index.
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let index = node.index();
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// Steps 2-3 are handled in Node::unbind_from_tree.
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// Steps 4-5.
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// Steps 4-5 are handled in Node::unbind_from_tree.
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// Step 6. For each live range whose start node is parent and start offset is greater than index,
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// decrease its start offset by 1.
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// Step 7. For each live range whose end node is parent and end offset is greater than index,
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// decrease its end offset by 1.
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parent.ranges().decrease_above(parent, index, 1);
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// Parent had ranges, we needed the index, let's keep track of
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// it to avoid computing it for other ranges when calling
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// unbind_from_tree recursively.
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@ -3925,7 +3936,12 @@ impl VirtualMethods for Node {
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/// <https://dom.spec.whatwg.org/#concept-node-remove>
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fn unbind_from_tree(&self, context: &UnbindContext, can_gc: CanGc) {
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self.super_type().unwrap().unbind_from_tree(context, can_gc);
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if !self.ranges_is_empty() {
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// Ranges should only drain to the parent from inclusive non-shadow
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// including descendants. If we're in a shadow tree at this point then the
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// unbind operation happened further up in the tree and we should not
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// drain any ranges.
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if !self.is_in_a_shadow_tree() && !self.ranges_is_empty() {
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self.ranges().drain_to_parent(context, self);
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}
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}
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