Fixed failing completion tests.

ICSharpCode.NRefactory.CSharp/Completion/CSharpParameterCompletionEngine.cs

@@ -351,6 +351,7 @@ namespace ICSharpCode.NRefactory.CSharp.Completion
 						bracketStack.Push(parameter);
 						parameter = new Stack<int>();
 						break;
+					case '[':
 					case '(':
 						if (inString || inChar || inVerbatimString || inSingleComment || inMultiLineComment) {
 							break;
@@ -367,6 +368,7 @@ namespace ICSharpCode.NRefactory.CSharp.Completion
 							return -1;
 						}
 						break;
+					case ']':
 					case ')':
 						if (inString || inChar || inVerbatimString || inSingleComment || inMultiLineComment) {
 							break;