Add test-case for #1462

ICSharpCode.Decompiler.Tests/TestCases/Pretty/ConstantsTests.cs

@@ -1,4 +1,6 @@
-namespace ICSharpCode.Decompiler.Tests.TestCases.Pretty
+using System.Threading.Tasks;
+
+namespace ICSharpCode.Decompiler.Tests.TestCases.Pretty
 {
 	internal class ConstantsTests
 	{
@@ -24,6 +26,12 @@
 			Test((v | 0x123) == 0);
 		}
 
+		public void Enum_Flag_Check(TaskCreationOptions v)
+		{
+			Test((v & TaskCreationOptions.AttachedToParent) != 0);
+			Test((v & TaskCreationOptions.AttachedToParent) == 0);
+		}
+
 		private void Test(bool expr)
 		{
 		}

ICSharpCode.Decompiler/CSharp/ExpressionBuilder.cs

@@ -773,8 +773,9 @@ namespace ICSharpCode.Decompiler.CSharp
 				NullableType.GetUnderlyingType(right.Type).Kind == TypeKind.Enum &&
 				right.Expression is BinaryOperatorExpression binaryExpr &&
 				binaryExpr.Operator == BinaryOperatorType.BitwiseAnd)
+			{
 				return AdjustConstantExpressionToType(left, compilation.FindType(KnownTypeCode.Int32));
-			else
+			} else
 				return AdjustConstantExpressionToType(left, right.Type);
 		}