Use :is for non-leading nesting with multiple compound selectors

devongovett · devongovett · commit 865270134da6 · 2022-10-11T22:36:26.000-07:00
diff --git a/src/lib.rs b/src/lib.rs
@@ -18891,7 +18891,7 @@ mod tests {
         }
       "#,
       indoc! {r#"
-        .baz .foo .bar {
+        .baz :is(.foo .bar) {
           background: green;
         }
       "#},
diff --git a/src/selector.rs b/src/selector.rs
@@ -966,6 +966,7 @@ where
   let mut combinators = selector.iter_raw_match_order().rev().filter_map(|x| x.as_combinator());
   let compound_selectors = selector.iter_raw_match_order().as_slice().split(|x| x.is_combinator()).rev();
 
+  let mut first = true;
   let mut combinators_exhausted = false;
   for mut compound in compound_selectors {
     debug_assert!(!combinators_exhausted);
@@ -984,8 +985,9 @@ where
       continue;
     }
 
-    let has_leading_nesting = matches!(compound[0], Component::Nesting);
+    let has_leading_nesting = first && matches!(compound[0], Component::Nesting);
     let first_index = if has_leading_nesting { 1 } else { 0 };
+    first = false;
 
     // 1. If there is only one simple selector in the compound selectors
     //    which is a universal selector, append the result of
