refactorings: give synthetic target a chance: try refactoring on reference (IDEA-237759)

GitOrigin-RevId: 14e8734e38eae5c17db6fff3eac8b029f1f6a6e7

java/java-tests/testData/refactoring/introduceVariable/EnumValues.after.java

@@ -0,0 +1,11 @@
+
+enum E {
+  ;
+
+  public static void m() {
+      E[] vs = values();
+      for (E value : vs) {
+
+    }
+  }
+}

java/java-tests/testData/refactoring/introduceVariable/EnumValues.java

@@ -0,0 +1,10 @@
+
+enum E {
+  ;
+
+  public static void m() {
+    for (E value : val<caret>ues()) {
+
+    }
+  }
+}

java/java-tests/testSrc/com/intellij/java/refactoring/IntroduceVariableTest.java

@@ -242,7 +242,8 @@ public class IntroduceVariableTest extends LightJavaCodeInsightTestCase {
   public void testPolyadic() { doTest("b1", true, true, true, "boolean"); }
   public void testAssignmentToUnresolvedReference() { doTest("collection", true, true, true, "java.util.List<? extends java.util.Collection<?>>"); }
   public void testSubstringInSwitch() { doTest("ba", false, false, false, JAVA_LANG_STRING);}
-
+  public void testEnumValues() { doTest("vs", false, false, false, "E[]"); }
+  
   public void testNameSuggestion() {
     String expectedTypeName = "Path";
     doTest(new MockIntroduceVariableHandler("path", true, false, false, expectedTypeName) {

platform/lang-impl/src/com/intellij/refactoring/actions/BaseRefactoringAction.java

@@ -212,7 +212,7 @@ public abstract class BaseRefactoringAction extends AnAction implements UpdateIn
     PsiFile file = dataContext.getData(CommonDataKeys.PSI_FILE);
     PsiElement element = dataContext.getData(CommonDataKeys.PSI_ELEMENT);
     Language[] languages = dataContext.getData(LangDataKeys.CONTEXT_LANGUAGES);
-    if (element == null || !isAvailableForLanguage(element.getLanguage())) {
+    if (element == null|| element instanceof SyntheticElement || !isAvailableForLanguage(element.getLanguage())) {
       if (file == null || editor == null) {
         return null;
       }