(Rather ugly) fix for indexer accessor's ImplementedInterfaceMembers.

ICSharpCode.NRefactory/TypeSystem/InheritanceHelper.cs

@@ -73,36 +73,38 @@ namespace ICSharpCode.NRefactory.TypeSystem
 				if (member is IMethod && ((IMethod)member).IsAccessor) {
 					var accessorOwner = ((IMethod)member).AccessorOwner;
 					foreach (IMember baseOwner in baseType.GetMembers(m => m.Name == accessorOwner.Name, GetMemberOptions.IgnoreInheritedMembers)) {
-						if (accessorOwner is IProperty && baseOwner is IProperty) {
-							var accessorProperty = (IProperty)accessorOwner;
-							var baseProperty = (IProperty)baseOwner;
-							if (member == accessorProperty.Getter && baseProperty.CanGet) {
-								if (specializedMember != null)
-									yield return SpecializedMember.Create(baseProperty.Getter, specializedMember.Substitution);
-								else
-									yield return baseProperty.Getter;
+						if (SignatureComparer.Ordinal.Equals(accessorOwner, baseOwner)) {
+							if (accessorOwner is IProperty && baseOwner is IProperty) {
+								var accessorProperty = (IProperty)accessorOwner;
+								var baseProperty = (IProperty)baseOwner;
+								if (member == accessorProperty.Getter && baseProperty.CanGet) {
+									if (specializedMember != null)
+										yield return SpecializedMember.Create(baseProperty.Getter, specializedMember.Substitution);
+									else
+										yield return baseProperty.Getter;
+								}
+								if (member == accessorProperty.Setter && baseProperty.CanSet) {
+									if (specializedMember != null)
+										yield return SpecializedMember.Create(baseProperty.Setter, specializedMember.Substitution);
+									else
+										yield return baseProperty.Setter;
+								}
 							}
-							if (member == accessorProperty.Setter && baseProperty.CanSet) {
-								if (specializedMember != null)
-									yield return SpecializedMember.Create(baseProperty.Setter, specializedMember.Substitution);
-								else
-									yield return baseProperty.Setter;
-							}
-						}
-						else if (accessorOwner is IEvent && baseOwner is IEvent) {
-							var accessorEvent = (IEvent)accessorOwner;
-							var baseEvent = (IEvent)baseOwner;
-							if (member == accessorEvent.AddAccessor && baseEvent.CanAdd) {
-								if (specializedMember != null)
-									yield return SpecializedMember.Create(baseEvent.AddAccessor, specializedMember.Substitution);
-								else
-									yield return baseEvent.AddAccessor;
-							}
-							if (member == accessorEvent.RemoveAccessor && baseEvent.CanRemove) {
-								if (specializedMember != null)
-									yield return SpecializedMember.Create(baseEvent.RemoveAccessor, specializedMember.Substitution);
-								else
-									yield return baseEvent.RemoveAccessor;
+							else if (accessorOwner is IEvent && baseOwner is IEvent) {
+								var accessorEvent = (IEvent)accessorOwner;
+								var baseEvent = (IEvent)baseOwner;
+								if (member == accessorEvent.AddAccessor && baseEvent.CanAdd) {
+									if (specializedMember != null)
+										yield return SpecializedMember.Create(baseEvent.AddAccessor, specializedMember.Substitution);
+									else
+										yield return baseEvent.AddAccessor;
+								}
+								if (member == accessorEvent.RemoveAccessor && baseEvent.CanRemove) {
+									if (specializedMember != null)
+										yield return SpecializedMember.Create(baseEvent.RemoveAccessor, specializedMember.Substitution);
+									else
+										yield return baseEvent.RemoveAccessor;
+								}
 							}
 						}
 					}