Auto merge of #13110 - emilio:element-flags, r=SimonSapin

Fix incremental restyling under some circumstances due to our bogus use of ElementFlags.

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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors

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- [x] There are tests for these changes OR

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Depends on https://github.com/servo/rust-selectors/pull/98

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This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/13110)
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2 files changed, 6 insertions, 6 deletions

diff --git a/components/script/dom/element.rs b/components/script/dom/element.rs
index e0342ebc3a6..193fb16b937 100644
--- a/components/script/dom/element.rs
+++ b/components/script/dom/element.rs
@@ -70,7 +70,7 @@ use html5ever::serialize::SerializeOpts;
 use html5ever::serialize::TraversalScope;
 use html5ever::serialize::TraversalScope::{ChildrenOnly, IncludeNode};
 use html5ever::tree_builder::{LimitedQuirks, NoQuirks, Quirks};
-use selectors::matching::{ElementFlags, matches};
+use selectors::matching::{ElementFlags, MatchingReason, matches};
 use selectors::matching::{HAS_SLOW_SELECTOR, HAS_EDGE_CHILD_SELECTOR, HAS_SLOW_SELECTOR_LATER_SIBLINGS};
 use selectors::parser::{AttrSelector, NamespaceConstraint, parse_author_origin_selector_list_from_str};
 use std::ascii::AsciiExt;
@@ -2006,7 +2006,7 @@ impl ElementMethods for Element {
         match parse_author_origin_selector_list_from_str(&selectors) {
             Err(()) => Err(Error::Syntax),
             Ok(ref selectors) => {
-                Ok(matches(selectors, &Root::from_ref(self), None))
+                Ok(matches(selectors, &Root::from_ref(self), None, MatchingReason::Other))
             }
         }
     }
@@ -2024,7 +2024,7 @@ impl ElementMethods for Element {
                 let root = self.upcast::<Node>();
                 for element in root.inclusive_ancestors() {
                     if let Some(element) = Root::downcast::<Element>(element) {
-                        if matches(selectors, &element, None) {
+                        if matches(selectors, &element, None, MatchingReason::Other) {
                             return Ok(Some(element));
                         }
                     }
diff --git a/components/script/dom/node.rs b/components/script/dom/node.rs
index 49aa8242b34..555c7719fb1 100644
--- a/components/script/dom/node.rs
+++ b/components/script/dom/node.rs
@@ -63,7 +63,7 @@ use script_layout_interface::message::Msg;
 use script_layout_interface::{HTMLCanvasData, OpaqueStyleAndLayoutData};
 use script_layout_interface::{LayoutNodeType, LayoutElementType, TrustedNodeAddress};
 use script_traits::UntrustedNodeAddress;
-use selectors::matching::matches;
+use selectors::matching::{MatchingReason, matches};
 use selectors::parser::Selector;
 use selectors::parser::parse_author_origin_selector_list_from_str;
 use std::borrow::ToOwned;
@@ -319,7 +319,7 @@ impl<'a> Iterator for QuerySelectorIterator {
         // (instead of passing `None`)? Probably.
         self.iterator.by_ref().filter_map(|node| {
             if let Some(element) = Root::downcast(node) {
-                if matches(selectors, &element, None) {
+                if matches(selectors, &element, None, MatchingReason::Other) {
                     return Some(Root::upcast(element));
                 }
             }
@@ -711,7 +711,7 @@ impl Node {
             // Step 3.
             Ok(ref selectors) => {
                 Ok(self.traverse_preorder().filter_map(Root::downcast).find(|element| {
-                    matches(selectors, element, None)
+                    matches(selectors, element, None, MatchingReason::Other)
                 }))
             }
         }