include library prefix suggestions when suggesting constructors

pkg/analysis_server/lib/src/services/completion/imported_computer.dart

 // Copyright (c) 2014, 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 services.completion.computer.dart.toplevel;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analysis_server/src/protocol_server.dart'
@@ skipping 88 matching lines @@
       future = cache.computeImportInfo(request.unit, request.searchEngine,
           shouldWaitForLowPrioritySuggestions);
     }
     if (future != null) {
       return future.then(addSuggestions);
     }
     return addSuggestions(true);
   }
 
   /**
-   * Add constructor suggestions from the cache.
+   * Add constructor and library prefix suggestions from the cache.
    * To reduce the number of suggestions sent to the client,
    * filter the suggestions based upon the first character typed.
    * If no characters are available to use for filtering,
    * then exclude all low priority suggestions.
    */
   void _addConstructorSuggestions() {
     String filterText = request.filterText;
     if (filterText.length > 1) {
       filterText = filterText.substring(0, 1);
     }
     DartCompletionCache cache = request.cache;
     _addFilteredSuggestions(filterText, cache.importedConstructorSuggestions);
+    _addFilteredSuggestions(filterText, cache.libraryPrefixSuggestions);
   }
 
   /**
    * Add imported element suggestions.
    */
   void _addElementSuggestions(List<Element> elements,
       {int relevance: DART_RELEVANCE_DEFAULT}) {
     elements.forEach((Element elem) {
       if (elem is! ClassElement) {
         if (typesOnly) {
@@ skipping 100 matching lines @@
     _addFilteredSuggestions(filterText, cache.libraryPrefixSuggestions);
     if (!typesOnly) {
       _addFilteredSuggestions(filterText, cache.otherImportedSuggestions);
       if (!excludeVoidReturn) {
         _addFilteredSuggestions(
             filterText, cache.importedVoidReturnSuggestions);
       }
     }
   }
 }