preserve comments: invert if (IDEA-205835)

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;
+    }
+}