Add quick fix to remove duplicate annotation without parameters (IDEA-249508)

GitOrigin-RevId: fea7daeb0bb40724325182d6041a20aa141fbbf2

java/java-impl/src/com/intellij/codeInsight/intention/impl/CollapseAnnotationsFix.java

@@ -1,8 +1,10 @@
 // Copyright 2000-2020 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package com.intellij.codeInsight.intention.impl;
 
+import com.intellij.codeInsight.intention.QuickFixFactory;
 import com.intellij.codeInspection.LocalQuickFixAndIntentionActionOnPsiElement;
 import com.intellij.java.JavaBundle;
+import com.intellij.java.analysis.JavaAnalysisBundle;
 import com.intellij.openapi.editor.Editor;
 import com.intellij.openapi.project.Project;
 import com.intellij.psi.*;
@@ -94,11 +96,15 @@ public final class CollapseAnnotationsFix extends LocalQuickFixAndIntentionActio
   }
 
   @Nullable
-  public static CollapseAnnotationsFix from(PsiAnnotation annotation) {
+  public static LocalQuickFixAndIntentionActionOnPsiElement from(PsiAnnotation annotation) {
     PsiAnnotationOwner owner = annotation.getOwner();
     String name = annotation.getQualifiedName();
+    if (owner == null || name == null) return null;
     PsiNameValuePair[] attributes = annotation.getParameterList().getAttributes();
-    if (owner == null || name == null || attributes.length != 1) return null;
+    if (attributes.length == 0) {
+      return QuickFixFactory.getInstance().createDeleteFix(annotation, JavaAnalysisBundle.message("intention.text.remove.annotation"));
+    }
+    if (attributes.length != 1) return null;
     PsiNameValuePair attribute = attributes[0];
     if (attribute.getValue() == null) return null;
     PsiMethod annoMethod = findAttributeMethod(attribute);

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/collapseAnnotationsFix/afterNoArgs.java

@@ -0,0 +1,5 @@
+// "Remove" "true"
+
+@XYZ
+class X{}
+@interface XYZ {}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/collapseAnnotationsFix/beforeNoArgs.java

@@ -0,0 +1,6 @@
+// "Remove" "true"
+
+@X<caret>YZ
+@XYZ
+class X{}
+@interface XYZ {}