Only search in types defined in MainAssembly. Remove old debug message.

ILSpy/Languages/CodeMappingInfo.cs

@@ -47,7 +47,7 @@ namespace ICSharpCode.ILSpy
 
 		public void AddMapping(MethodDefinitionHandle parent, MethodDefinitionHandle part)
 		{
-			Debug.Print("Parent: " + MetadataTokens.GetRowNumber(parent) + " Part: " + MetadataTokens.GetRowNumber(part));
+			//Debug.Print("Parent: " + MetadataTokens.GetRowNumber(parent) + " Part: " + MetadataTokens.GetRowNumber(part));
 			if (parents.ContainsKey(part))
 				return;
 			parents.Add(part, parent);

ILSpy/SearchPane.cs

@@ -222,7 +222,7 @@ namespace ICSharpCode.ILSpy
 							continue;
 						CancellationToken cancellationToken = cts.Token;
 
-						foreach (var type in typeSystem.GetTopLevelTypeDefinitions()) {
+						foreach (var type in typeSystem.MainAssembly.TopLevelTypeDefinitions) {
 							cancellationToken.ThrowIfCancellationRequested();
 							searcher.Search(type, language, AddResult);
 						}