fix #332: use InsertParenthesesVisitor to insert required parentheses before converting to VB .NET

ILSpy/VB/VBLanguage.cs

@@ -407,7 +407,9 @@ namespace ICSharpCode.ILSpy.VB
 			astBuilder.RunTransformations(transformAbortCondition);
 			if (options.DecompilerSettings.ShowXmlDocumentation)
 				AddXmlDocTransform.Run(astBuilder.CompilationUnit);
-			var unit = astBuilder.CompilationUnit.AcceptVisitor(new CSharpToVBConverterVisitor(new ILSpyEnvironmentProvider()), null);
+			var csharpUnit = astBuilder.CompilationUnit;
+			csharpUnit.AcceptVisitor(new NRefactory.CSharp.InsertParenthesesVisitor() { InsertParenthesesForReadability = true });
+			var unit = csharpUnit.AcceptVisitor(new CSharpToVBConverterVisitor(new ILSpyEnvironmentProvider()), null);
 			var outputFormatter = new VBTextOutputFormatter(output);
 			var formattingPolicy = new VBFormattingOptions();
 			unit.AcceptVisitor(new OutputVisitor(outputFormatter, formattingPolicy), null);