Java: preview for safe delete quick-fix

GitOrigin-RevId: ecc86cac9a859eb5c1b580f780d343a7dafb14da

java/java-impl/src/com/intellij/codeInsight/daemon/impl/quickfix/SafeDeleteFix.java

@@ -1,23 +1,10 @@
-/*
- * Copyright 2000-2009 JetBrains s.r.o.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
+// Copyright 2000-2023 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
 package com.intellij.codeInsight.daemon.impl.quickfix;
 
 import com.intellij.codeInsight.FileModificationService;
 import com.intellij.codeInsight.daemon.QuickFixBundle;
 import com.intellij.codeInsight.daemon.impl.analysis.HighlightMessageUtil;
+import com.intellij.codeInsight.intention.preview.IntentionPreviewInfo;
 import com.intellij.codeInspection.LocalQuickFixAndIntentionActionOnPsiElement;
 import com.intellij.openapi.editor.Editor;
 import com.intellij.openapi.project.Project;
@@ -26,6 +13,7 @@ import com.intellij.psi.PsiFile;
 import com.intellij.psi.PsiParameter;
 import com.intellij.psi.PsiSubstitutor;
 import com.intellij.psi.util.PsiFormatUtilBase;
+import com.intellij.psi.util.PsiTreeUtil;
 import com.intellij.refactoring.safeDelete.SafeDeleteHandler;
 import com.intellij.refactoring.safeDelete.SafeDeleteProcessor;
 import com.intellij.util.ObjectUtils;
@@ -69,9 +57,15 @@ public class SafeDeleteFix extends LocalQuickFixAndIntentionActionOnPsiElement {
     }
   }
 
+  @Override
+  public @NotNull IntentionPreviewInfo generatePreview(@NotNull Project project, @NotNull Editor editor, @NotNull PsiFile file) {
+    PsiElement element = PsiTreeUtil.findSameElementInCopy(getStartElement(), file);
+    element.delete();
+    return IntentionPreviewInfo.DIFF;
+  }
+
   @Override
   public boolean startInWriteAction() {
     return false;
   }
-
 }

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/removeUnusedParameter/after1.java

@@ -1,4 +1,4 @@
-// "Safe delete 'i'" "true"
+// "Safe delete 'i'" "true-preview"
 import java.io.*;
 
 class a {

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/removeUnusedParameter/after2.java

@@ -1,4 +1,4 @@
-// "Safe delete 'i'" "true"
+// "Safe delete 'i'" "true-preview"
 import java.io.*;
 
 class a {

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/removeUnusedParameter/before1.java

@@ -1,4 +1,4 @@
-// "Safe delete 'i'" "true"
+// "Safe delete 'i'" "true-preview"
 import java.io.*;
 
 class a {

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/removeUnusedParameter/before2.java

@@ -1,4 +1,4 @@
-// "Safe delete 'i'" "true"
+// "Safe delete 'i'" "true-preview"
 import java.io.*;
 
 class a {