Fixed IList for types that do not implement IList, but their superclass does.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@2930 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/Misc/Debugger/Debugger.Core/Project/Src/Metadata/DebugType.cs

@@ -164,8 +164,12 @@ namespace Debugger.MetaData
 					return inter;
 				}
 			}
+			if (BaseType != null) {
+				return BaseType.GetInterface(fullName);
+			} else {
 				return null;
 			}
+		}
 		
 		/// <summary> Returns generics arguments for a type or an emtpy 
 		/// array for non-generic types. </summary>
@@ -472,15 +476,15 @@ namespace Debugger.MetaData
 		/// <remarks> Returns false if the given type is same as the current type </remarks>
 		public bool IsSubclassOf(DebugType superType)
 		{
-			// Does this type implement the interface?
+			DebugType type = this;
+			while (type != null) {
+				if (type.Equals(superType)) return true;
 				if (superType.IsInterface) {
-				foreach(DebugType inter in this.Interfaces) {
+					// Does this 'type' implement the interface?
+					foreach(DebugType inter in type.Interfaces) {
 						if (inter == superType) return true;
 					}
 				}
-			DebugType type = this.BaseType;
-			while (type != null) {
-				if (type.Equals(superType)) return true;
 				type = type.BaseType;
 			}
 			return false;