Tweak navigation for 'part of' directives.

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/analysis/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 119 matching lines @@
   }
 
   @override
   visitPartDirective(PartDirective node) {
     _addUriDirectiveRegion(node, node.element);
     super.visitPartDirective(node);
   }
 
   @override
   visitPartOfDirective(PartOfDirective node) {
-    computer._addRegion_tokenStart_nodeEnd(
-        node.keyword, node.libraryName, node.element);
+    computer._addRegionForNode(node.libraryName, node.element);
     super.visitPartOfDirective(node);
   }
 
   @override
   visitPostfixExpression(PostfixExpression node) {
     super.visitPostfixExpression(node);
     computer._addRegionForToken(node.operator, node.bestElement);
   }
 
   @override
@@ skipping 97 matching lines @@
     }
     collector.addRegion(offset, length, kind, location);
   }
 
   void _addRegion_nodeStart_nodeEnd(AstNode a, AstNode b, Element element) {
     int offset = a.offset;
     int length = b.end - offset;
     _addRegion(offset, length, element);
   }
 
-  void _addRegion_tokenStart_nodeEnd(Token a, AstNode b, Element element) {
-    int offset = a.offset;
-    int length = b.end - offset;
-    _addRegion(offset, length, element);
-  }
-
   void _addRegionForNode(AstNode node, Element element) {
     int offset = node.offset;
     int length = node.length;
     _addRegion(offset, length, element);
   }
 
   void _addRegionForToken(Token token, Element element) {
     int offset = token.offset;
     int length = token.length;
     _addRegion(offset, length, element);
@@ skipping 27 matching lines @@
     }
     // The node starts or ends in the range.
     if (isInRange(node.offset) || isInRange(node.end)) {
       node.accept(visitor);
       return;
     }
     // Go deeper.
     super.visitNode(node);
   }
 }