Fix tokens used for catch-when clause.

ICSharpCode.Decompiler/CSharp/OutputVisitor/CSharpOutputVisitor.cs

@@ -1812,11 +1812,11 @@ namespace ICSharpCode.Decompiler.CSharp.OutputVisitor
 				Space();
 				WriteKeyword(CatchClause.WhenKeywordRole);
 				Space(policy.SpaceBeforeIfParentheses);
-				LPar();
+				WriteToken(CatchClause.CondLPar);
 				Space(policy.SpacesWithinIfParentheses);
 				catchClause.Condition.AcceptVisitor(this);
 				Space(policy.SpacesWithinIfParentheses);
-				RPar();
+				WriteToken(CatchClause.CondRPar);
 			}
 			WriteBlock(catchClause.Body, policy.StatementBraceStyle);
 			EndNode(catchClause);

ICSharpCode.Decompiler/CSharp/Syntax/Statements/TryCatchStatement.cs

@@ -90,6 +90,8 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 		public static readonly TokenRole CatchKeywordRole = new TokenRole("catch");
 		public static readonly TokenRole WhenKeywordRole = new TokenRole("when");
 		public static readonly Role<Expression> ConditionRole = Roles.Condition;
+		public static readonly TokenRole CondLPar = new TokenRole("(");
+		public static readonly TokenRole CondRPar = new TokenRole(")");
 
 		#region Null
 		public new static readonly CatchClause Null = new NullCatchClause();
@@ -195,7 +197,7 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 				if (string.IsNullOrEmpty(value))
 					SetChildByRole(Roles.Identifier, null);
 				else
-					SetChildByRole (Roles.Identifier, Identifier.Create (value));
+					SetChildByRole(Roles.Identifier, Identifier.Create(value));
 			}
 		}
 
@@ -216,11 +218,19 @@ namespace ICSharpCode.Decompiler.CSharp.Syntax
 			get { return GetChildByRole(WhenKeywordRole); }
 		}
 
+		public CSharpTokenNode CondLParToken {
+			get { return GetChildByRole(CondLPar); }
+		}
+
 		public Expression Condition {
 			get { return GetChildByRole(ConditionRole); }
 			set { SetChildByRole(ConditionRole, value); }
 		}
 
+		public CSharpTokenNode CondRParToken {
+			get { return GetChildByRole(CondRPar); }
+		}
+
 		public BlockStatement Body {
 			get { return GetChildByRole(Roles.Body); }
 			set { SetChildByRole(Roles.Body, value); }