IDEA-268397: [refactor this] enable 'make static' refactoring on class declarations

GitOrigin-RevId: 0ab9f8b753d0a51a828a03efb96aa435207627be

java/java-impl/src/com/intellij/refactoring/makeStatic/MakeStaticHandler.java

@@ -85,7 +85,7 @@ public class MakeStaticHandler implements RefactoringActionHandler, ContextAware
   @Override
   public boolean isAvailableForQuickList(@NotNull Editor editor, @NotNull PsiFile file, @NotNull DataContext dataContext) {
     PsiElement element = BaseRefactoringAction.getElementAtCaret(editor, file);
-    return RefactoringActionContextUtil.getJavaMethodHeader(element) != null;
+    return RefactoringActionContextUtil.getJavaMethodHeader(element) != null || RefactoringActionContextUtil.isJavaClassHeader(element);
   }
 
   public static void invoke(final PsiTypeParameterListOwner member) {

java/java-tests/testData/refactoring/refactorThis/MakeStaticFilteredOnStaticClass.java

@@ -0,0 +1,4 @@
+public class Test {
+  static class Inner<caret> {
+  }
+}

java/java-tests/testData/refactoring/refactorThis/MakeStaticOnClassDeclaration.java

@@ -0,0 +1,8 @@
+public class Test {
+  int x = 42;
+  class Inner<caret> {
+    void test(){
+      System.out.println(x);
+    }
+  }
+}

java/java-tests/testSrc/com/intellij/java/refactoring/RefactorThisTest.kt

@@ -155,10 +155,18 @@ class RefactorThisTest: LightJavaCodeInsightTestCase() {
     assertFalse(doActionExists<WrapReturnValueAction>())
   }
 
-  fun testMakeStatic() {
+  fun testMakeStaticOnMethodDeclaration() {
     assertTrue(doActionExists<MakeStaticAction>())
   }
 
+  fun testMakeStaticOnClassDeclaration() {
+    assertTrue(doActionExists<MakeStaticAction>())
+  }
+
+  fun testMakeStaticFilteredOnStaticClass() {
+    assertFalse(doActionExists<MakeStaticAction>())
+  }
+
   fun testMakeStaticFiltered() {
     assertFalse(doActionExists<MakeStaticAction>())
   }