suggest imported functions in argument list

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 'package:analysis_server/src/protocol_server.dart' hide Element,
     ElementKind;
@@ skipping 30 matching lines @@
 /**
  * A visitor for determining which imported class and top level variable
  * should be suggested and building those suggestions.
  */
 class _ImportedVisitor extends GeneralizingAstVisitor<Future<bool>> {
   final DartCompletionRequest request;
 
   _ImportedVisitor(this.request);
 
   @override
+  Future<bool> visitArgumentList(ArgumentList node) {
+    return _addImportedElementSuggestions(node, excludeVoidReturn: true);
+  }
+
+  @override
   Future<bool> visitBlock(Block node) {
     return _addImportedElementSuggestions(node);
   }
 
   @override
   Future<bool> visitCascadeExpression(CascadeExpression node) {
     // Make suggestions for the target, but not for the selector
     // InvocationComputer makes selector suggestions
     Expression target = node.target;
     if (target != null && request.offset <= target.end) {
@@ skipping 323 matching lines @@
           importElem.isDeprecated,
           false);
       LibraryElement lib = importElem.importedLibrary;
       if (lib != null) {
         suggestion.element = newElement_fromEngine(lib);
       }
       request.suggestions.add(suggestion);
     }
   }
 }