filter undesired suggestions from prefix expression

pkg/analysis_server/lib/src/services/completion/local_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.local;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol.dart' as protocol show Element, ElementKind;
 import 'package:analysis_server/src/protocol.dart' hide Element, ElementKind;
@@ skipping 141 matching lines @@
       type = loopVar.type;
     } else {
       id = node.identifier;
       type = null;
     }
     _addLocalVarSuggestion(id, type);
     visitNode(node);
   }
 
   @override
+  visitPrefixedIdentifier(PrefixedIdentifier node) {
+    // InvocationComputer adds suggestions for prefixed elements
+    // but this computer adds suggestions for the prefix itself
+    SimpleIdentifier prefix = node.prefix;
+    if (prefix == null || request.offset <= prefix.end) {
+      visitNode(node);
+    }
+  }
+
+  @override
   visitForStatement(ForStatement node) {
     var varList = node.variables;
     if (varList != null) {
       varList.variables.forEach((VariableDeclaration varDecl) {
         _addLocalVarSuggestion(varDecl.name, varList.type);
       });
     }
     visitNode(node);
   }
 
@@ skipping 251 matching lines @@
     if (name == null || name.length <= 0) {
       return DYNAMIC;
     }
     TypeArgumentList typeArgs = type.typeArguments;
     if (typeArgs != null) {
       //TODO (danrubel) include type arguments
     }
     return name;
   }
 }