preserve comments: invert if (IDEA-205835)

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

@@ -227,7 +227,7 @@ public class InvertIfConditionAction extends PsiElementBaseIntentionAction {
         }
       } else {
         if (!(thenBranch instanceof PsiReturnStatement)) {
-          ifStatement = addAfterWithinCodeBlock(ifStatement, ct.markUnchanged(thenBranch));
+          ifStatement = addAfterWithinCodeBlock(ifStatement, ct.markUnchanged(thenBranch), ct);
         }
       }
       ct.replaceAndRestoreComments(Objects.requireNonNull(ifStatement.getThenBranch()), statement);
@@ -241,14 +241,14 @@ public class InvertIfConditionAction extends PsiElementBaseIntentionAction {
         element instanceof PsiForeachStatement && flow.getStartOffset(element) + 1 == endOffset) {
       PsiStatement statement = factory.createStatementFromText("continue;", ifStatement);
       statement = (PsiStatement)codeStyle.reformat(statement);
-      ifStatement = addAfterWithinCodeBlock(ifStatement, ct.markUnchanged(thenBranch));
+      ifStatement = addAfterWithinCodeBlock(ifStatement, ct.markUnchanged(thenBranch), ct);
       Objects.requireNonNull(ifStatement.getThenBranch()).replace(statement);
       return ifStatement;
     }
 
     if (element instanceof PsiReturnStatement) {
       PsiReturnStatement returnStatement = (PsiReturnStatement) element;
-      ifStatement = addAfterWithinCodeBlock(ifStatement, thenBranch);
+      ifStatement = addAfterWithinCodeBlock(ifStatement, thenBranch, ct);
       ct.replaceAndRestoreComments(Objects.requireNonNull(ifStatement.getThenBranch()), ct.markUnchanged(returnStatement).copy());
 
       ControlFlow flow2 = buildControlFlow(findCodeBlock(ifStatement));
@@ -356,27 +356,30 @@ public class InvertIfConditionAction extends PsiElementBaseIntentionAction {
     return stmt.getStatements()[0];
   }
 
-  private static PsiIfStatement addAfterWithinCodeBlock(@NotNull PsiIfStatement ifStatement, @NotNull PsiStatement branch) {
+  private static PsiIfStatement addAfterWithinCodeBlock(@NotNull PsiIfStatement ifStatement,
+                                                        @NotNull PsiStatement branch,
+                                                        CommentTracker ct) {
     final PsiElement parent = ifStatement.getParent();
     if (parent != null && !(parent instanceof PsiCodeBlock)) {
       branch = (PsiStatement)branch.copy();
       ifStatement = (PsiIfStatement)wrapWithCodeBlock(ifStatement);
     }
-    addAfter(ifStatement, branch);
+    addAfter(ifStatement, branch, ct);
     return ifStatement;
   }
 
-  static void addAfter(PsiIfStatement ifStatement, PsiStatement branch) throws IncorrectOperationException {
+  static void addAfter(PsiIfStatement ifStatement, PsiStatement branch, CommentTracker ct) throws IncorrectOperationException {
     if (branch instanceof PsiBlockStatement) {
       PsiBlockStatement blockStatement = (PsiBlockStatement) branch;
       final PsiCodeBlock block = blockStatement.getCodeBlock();
       final PsiElement firstBodyElement = block.getFirstBodyElement();
       final PsiElement lastBodyElement = block.getLastBodyElement();
       if (firstBodyElement != null && lastBodyElement != null) {
+        ct.markRangeUnchanged(firstBodyElement, lastBodyElement);
         ifStatement.getParent().addRangeAfter(firstBodyElement, lastBodyElement, ifStatement);
       }
     } else {
-      ifStatement.getParent().addAfter(branch, ifStatement);
+      ifStatement.getParent().addAfter(ct.markUnchanged(branch), ifStatement);
     }
   }
 

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

@@ -24,6 +24,7 @@ import com.intellij.psi.*;
 import com.intellij.psi.util.PsiTreeUtil;
 import com.intellij.util.IncorrectOperationException;
 import com.intellij.util.ObjectUtils;
+import com.siyeh.ig.psiutils.CommentTracker;
 import com.siyeh.ig.psiutils.ControlFlowUtils;
 import org.jetbrains.annotations.Nls;
 import org.jetbrains.annotations.NotNull;
@@ -51,8 +52,9 @@ public class UnwrapElseBranchAction extends PsiElementBaseIntentionAction {
           elseBranch = ifStatement.getElseBranch();
           LOG.assertTrue(elseBranch != null);
         }
-        InvertIfConditionAction.addAfter(ifStatement, elseBranch);
-        elseBranch.delete();
+        CommentTracker ct = new CommentTracker();
+        InvertIfConditionAction.addAfter(ifStatement, elseBranch, ct);
+        ct.deleteAndRestoreComments(elseBranch);
       }
     }
   }

java/java-tests/testData/codeInsight/invertIfCondition/afterCommentsInsideThen.java

@@ -0,0 +1,14 @@
+// "Invert 'if' condition" "true"
+public class C {
+   public boolean isAcceptable(Object element) {
+       if (element == null) {
+           return false;
+       }
+       System.out.println();
+       //c1
+       if (true) {
+         //c2
+       }
+       return false;
+    }
+}

java/java-tests/testData/codeInsight/invertIfCondition/beforeCommentsInsideThen.java

@@ -0,0 +1,13 @@
+// "Invert 'if' condition" "true"
+public class C {
+   public boolean isAcceptable(Object element) {
+        i<caret>f (element != null) {
+            System.out.println();
+            //c1
+            if (true) {
+              //c2
+            }
+        }
+        return false;
+    }
+}

java/java-tests/testData/codeInsight/unwrapElseBranch/afterBlock3.java

@@ -4,6 +4,8 @@ class T {
     void f(boolean b) {
         if (b)
             throw new RuntimeException("When true");
+            //c1
+
         System.out.println("Otherwise");
     }
 }

java/java-tests/testData/codeInsight/unwrapElseBranch/beforeBlock3.java

@@ -6,6 +6,6 @@ class T {
             throw new RuntimeException("When true");
         <caret>else {
             System.out.println("Otherwise");
-        }
+        }//c1
     }
 }