[Completion] Filter out namespaces that only contain inaccessible

types.

ICSharpCode.NRefactory.CSharp/Completion/CSharpCompletionEngine.cs

@@ -1425,7 +1425,7 @@ namespace ICSharpCode.NRefactory.CSharp.Completion
 				}
 
 				foreach (var curNs in n.Namespace.ChildNamespaces) {
-					wrapper.AddNamespace(curNs);
+					wrapper.AddNamespace(lookup, curNs);
 				}
 			}
 		}
@@ -2169,12 +2169,11 @@ namespace ICSharpCode.NRefactory.CSharp.Completion
 			var result = new CompletionDataWrapper(this);
 			if (resolveResult is NamespaceResolveResult) {
 				var nr = (NamespaceResolveResult)resolveResult;
-				if (!(resolvedNode.Parent is UsingDeclaration || resolvedNode.Parent != null && resolvedNode.Parent.Parent is UsingDeclaration)) {
 				var lookup = new MemberLookup(
 					ctx.CurrentTypeDefinition,
 					Compilation.MainAssembly
 					);
-
+				if (!(resolvedNode.Parent is UsingDeclaration || resolvedNode.Parent != null && resolvedNode.Parent.Parent is UsingDeclaration)) {
 					foreach (var cl in nr.Namespace.Types) {
 						if (hintType != null && hintType.Kind != TypeKind.Array && cl.Kind == TypeKind.Interface) {
 							continue;
@@ -2185,7 +2184,7 @@ namespace ICSharpCode.NRefactory.CSharp.Completion
 					}
 				}
 				foreach (var ns in nr.Namespace.ChildNamespaces) {
-					result.AddNamespace(ns);
+					result.AddNamespace(lookup, ns);
 				}
 			} else if (resolveResult is TypeResolveResult) {
 				var type = resolveResult.Type;
@@ -2306,7 +2305,7 @@ namespace ICSharpCode.NRefactory.CSharp.Completion
 				}
 				
 				foreach (var ns in nr.Namespace.ChildNamespaces) {
-					namespaceContents.AddNamespace(ns);
+					namespaceContents.AddNamespace(lookup, ns);
 				}
 				return namespaceContents.Result;
 			}

ICSharpCode.NRefactory.CSharp/Completion/CompletionDataWrapper.cs

@@ -67,10 +67,24 @@ namespace ICSharpCode.NRefactory.CSharp.Completion
 		
 		HashSet<string> usedNamespaces = new HashSet<string> ();
 
-		public void AddNamespace (INamespace ns)
+		bool IsAccessible(MemberLookup lookup, INamespace ns)
+		{
+			if (ns.Types.Any (t => lookup.IsAccessible (t, false)))
+				return true;
+			foreach (var child in ns.ChildNamespaces)
+				if (IsAccessible (lookup, child))
+					return true;
+			return false;
+		}
+		
+		public void AddNamespace (MemberLookup lookup, INamespace ns)
 		{
 			if (usedNamespaces.Contains (ns.Name))
 				return;
+			if (!IsAccessible (lookup, ns)) {
+				usedNamespaces.Add (ns.Name);
+				return;
+			}
 			usedNamespaces.Add (ns.Name);
 			result.Add (Factory.CreateNamespaceCompletionData (ns));
 		}