fix code completion invocation on getter

pkg/analysis_server/lib/src/services/completion/invocation_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.invocation;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/services/completion/dart_completion_manager.dart';
 import 'package:analysis_server/src/services/completion/optype.dart';
@@ skipping 131 matching lines @@
       node = node.parent;
     }
     if (node is ConstructorName) {
       // some PrefixedIdentifier nodes are transformed into
       // ConstructorName nodes during the resolution process.
       return new NamedConstructorSuggestionBuilder(request).computeFull(node);
     }
     if (node is PrefixedIdentifier) {
       SimpleIdentifier prefix = node.prefix;
       if (prefix != null) {
-        if (prefix.propagatedType != null) {
+        Element element = prefix.bestElement;
+        DartType type = prefix.bestType;
+        if (element is! ClassElement && type != null && !type.isDynamic) {
           InterfaceTypeSuggestionBuilder.suggestionsFor(
               request,
-              prefix.propagatedType);
-        } else {
-          Element element = prefix.bestElement;
-          if (element != null) {
-            return element.accept(this);
-          }
+              type);
+          return new Future.value(true);
+        } else if (element != null) {
+          return element.accept(this);
         }
       }
     }
     return new Future.value(false);
   }
 
   @override
   Future<bool> visitClassElement(ClassElement element) {
     if (element != null) {
       InterfaceType type = element.type;
@@ skipping 46 matching lines @@
     }
     return new Future.value(false);
   }
 
   @override
   Future<bool> visitVariableElement(VariableElement element) {
     InterfaceTypeSuggestionBuilder.suggestionsFor(request, element.type);
     return new Future.value(true);
   }
 }