invert if: preserve parenthesis when not safe to delete (IDEA-107783)

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

@@ -0,0 +1,10 @@
+// "Invert If Condition" "true"
+class A {
+    public boolean foo(boolean a, boolean b, boolean c, boolean d) {
+
+        if ((a || b) && !c && !d) {
+            return true;
+        }
+        return false;
+    }
+}

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

@@ -0,0 +1,9 @@
+// "Invert If Condition" "true"
+class A {
+    public boolean foo(boolean a, boolean b, boolean c, boolean d) {
+
+      if (!(a |<caret>| b) || c || d)
+        return false;
+      return true;
+    }
+}

java/openapi/src/com/intellij/codeInsight/CodeInsightServicesUtil.java

@@ -68,7 +68,11 @@ public class CodeInsightServicesUtil {
       if (expression.getOperationTokenType() == JavaTokenType.EXCL) {
         PsiExpression operand = expression.getOperand();
         if (operand instanceof PsiParenthesizedExpression) {
-          operand = ((PsiParenthesizedExpression)operand).getExpression();
+          final PsiElement parent = booleanExpression.getParent();
+          if (parent instanceof PsiPolyadicExpression && 
+              ((PsiPolyadicExpression)parent).getOperationTokenType() == JavaTokenType.ANDAND) {
+            operand = ((PsiParenthesizedExpression)operand).getExpression();
+          }
         }
         return operand;
       }