Fix whitespace handling in view transition pseudos

Closes #1087

Author: devongovett

src/lib.rs

@@ -6972,6 +6972,10 @@ mod tests {
         &format!(":root::{}(.foo.bar) {{position: fixed}}", name),
         &format!(":root::{}(.foo.bar){{position:fixed}}", name),
       );
+      minify_test(
+        &format!(":root::{}(  .foo.bar  ) {{position: fixed}}", name),
+        &format!(":root::{}(.foo.bar){{position:fixed}}", name),
+      );
       error_test(
         &format!(":root::{}(foo):first-child {{position: fixed}}", name),
         ParserError::SelectorError(SelectorError::InvalidPseudoClassAfterPseudoElement),

src/selector.rs

@@ -1090,10 +1090,14 @@ impl<'i> Parse<'i> for ViewTransitionPartSelector<'i> {
           _ => return Err(input.new_custom_error(ParserError::SelectorError(SelectorError::InvalidState))),
         }
       } else {
-        return Err(input.new_custom_error(ParserError::SelectorError(SelectorError::InvalidState)));
+        break;
       }
     }
 
+    if !input.is_exhausted() || (name.is_none() && classes.is_empty()) {
+      return Err(input.new_custom_error(ParserError::SelectorError(SelectorError::InvalidState)));
+    }
+
     Ok(ViewTransitionPartSelector { name, classes })
   }
 }