Fix selector-anb-no-unmatchable performance (#7042)

Author: romainmenke

.changeset/olive-candles-fry.md

@@ -0,0 +1,5 @@
+---
+"stylelint": patch
+---
+
+Fixed: `selector-anb-no-unmatchable` performance

lib/rules/selector-anb-no-unmatchable/index.js

@@ -46,13 +46,11 @@ const rule = (primary) => {
 		}
 
 		root.walkRules((ruleNode) => {
-			if (!isStandardSyntaxRule(ruleNode)) {
-				return;
-			}
+			if (!hasANPlusBNotationPseudoClasses(ruleNode.selector)) return;
 
-			ruleNode.selectors.forEach((selector) => {
-				if (!hasANPlusBNotationPseudoClasses(selector)) return;
+			if (!isStandardSyntaxRule(ruleNode)) return;
 
+			ruleNode.selectors.forEach((selector) => {
 				let cssTreeSelector;
 
 				try {