Fix for navigation reginos for instance creations with import prefixes.

pkg/analysis_server/lib/src/domains/analysis/navigation_dart.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library domains.analysis.navigation_dart;
 
 import 'package:analysis_server/plugin/analysis/navigation/navigation_core.dart';
 import 'package:analysis_server/src/protocol_server.dart' as protocol;
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
@@ skipping 270 matching lines @@
     Element element = node.staticElement;
     if (element == null) {
       return;
     }
     // if a synthetic constructor, navigate to the class
     if (element.isSynthetic) {
       element = element.enclosingElement;
     }
     // add regions
     TypeName typeName = node.type;
-    computer._addRegionForNode(typeName.name, element);
+    // [prefix].ClassName
+    {
+      Identifier name = typeName.name;
+      Identifier className = name;
+      if (name is PrefixedIdentifier) {
+        name.prefix.accept(this);
+        className = name.identifier;
+      }
+      computer._addRegionForNode(className, element);
+    }
     // <TypeA, TypeB>
     TypeArgumentList typeArguments = typeName.typeArguments;
     if (typeArguments != null) {
       typeArguments.accept(this);
     }
     // optional "name"
     if (node.name != null) {
       computer._addRegionForNode(node.name, element);
     }
   }
@@ skipping 10 matching lines @@
       }
     }
   }
 
   void _safelyVisit(AstNode node) {
     if (node != null) {
       node.accept(this);
     }
   }
 }