Update lib/rules/no-duplicate-attr-inheritance.js

Co-authored-by: Flo Edelmann <git@flo-edelmann.de>

Author: waynzh

lib/rules/no-duplicate-attr-inheritance.js

@@ -8,30 +8,20 @@ const utils = require('../utils')
 
 /** @param {VElement[]} elements */
 function isConditionalGroup(elements) {
-  let hasIf = false
-  let hasElse = false
-
-  for (const element of elements) {
-    if (utils.hasDirective(element, 'if')) {
-      if (hasIf || hasElse) {
-        return false
-      }
-      hasIf = true
-    } else if (utils.hasDirective(element, 'else-if')) {
-      if (!hasIf || hasElse) {
-        return false
-      }
-    } else if (utils.hasDirective(element, 'else')) {
-      if (!hasIf || hasElse) {
-        return false
-      }
-      hasElse = true
-    } else {
-      return false
-    }
+  if (elements.length < 2) {
+    return false
   }
 
-  return hasIf && (elements.length === 1 || hasElse)
+  const firstElement = element[0]
+  const lastElement = elements[elements.length - 1]
+  const inBetweenElements = elements.slice(1, -1)
+
+  return (
+    utils.hasDirective(firstElement, 'if') &&
+    (utils.hasDirective(lastElement, 'else-if') ||
+      utils.hasDirective(lastElement, 'else')) &&
+    inBetweenElements.every((element) => utils.hasDirective(element, 'else-if'))
+  )
 }
 
 /** @param {VElement[]} elements */