If a move has matching target/destination, signal the event as create or delete.

runtime/bin/file_patch.dart

 // Copyright (c) 2012, 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.
 
 patch class _File {
   /* patch */ static _exists(String path) native "File_Exists";
   /* patch */ static _create(String path) native "File_Create";
   /* patch */ static _createLink(String path, String target)
       native "File_CreateLink";
   /* patch */ static _linkTarget(String path) native "File_LinkTarget";
@@ skipping 75 matching lines @@
           if (event[2] != null) {
             path += Platform.pathSeparator;
             path += event[2];
           }
           return path;
         }
         void add(event) {
           if ((event.type & _events) == 0) return;
           events.add(event);
         }
+        void rewriteMove(event) {
+          if (event[3]) {
+            add(new FileSystemCreateEvent._(getPath(event)));
+          } else {
+            add(new FileSystemDeleteEvent._(getPath(event)));
+          }
+        }
         while (socket.available() > 0) {
           for (var event in _readEvents()) {
             if (event == null) continue;
             var path = getPath(event);
             if ((event[0] & FileSystemEvent.CREATE) != 0) {
               add(new FileSystemCreateEvent._(path));
             }
             if ((event[0] & FileSystemEvent.MODIFY) != 0) {
               add(new FileSystemModifyEvent._(path, true));
             }
             if ((event[0] & FileSystemEvent._MODIFY_ATTRIBUTES) != 0) {
               add(new FileSystemModifyEvent._(path, false));
             }
             if ((event[0] & FileSystemEvent.MOVE) != 0) {
               int link = event[1];
               if (link > 0) {
                 if (pair.containsKey(link)) {
                   events.add(
                       new FileSystemMoveEvent._(getPath(pair[link]), path));
                   pair.remove(link);
                 } else {
                   pair[link] = event;
                 }
               } else {
-                add(new FileSystemMoveEvent._(path, null));
+                rewriteMove(event);
               }
             }
             if ((event[0] & FileSystemEvent.DELETE) != 0) {
               add(new FileSystemDeleteEvent._(path));
             }
             if ((event[0] & FileSystemEvent._DELETE_SELF) != 0) {
               add(new FileSystemDeleteEvent._(path));
               stop = true;
             }
           }
         }
         for (var event in pair.values) {
-          events.add(new FileSystemMoveEvent._(getPath(event), null));
+          rewriteMove(event);
         }
       } else if (event == RawSocketEvent.CLOSED) {
       } else if (event == RawSocketEvent.READ_CLOSED) {
       } else {
         assert(false);
       }
       if (stop) socket.close();
       return events;
     })
     .listen(_controller.add, onDone: _cancel);
@@ skipping 14 matching lines @@
 
   int _watchPath(String path, int events, bool recursive)
       native "FileSystemWatcher_WatchPath";
   void _unwatchPath() native "FileSystemWatcher_UnwatchPath";
   List _readEvents() native "FileSystemWatcher_ReadEvents";
 }
 
 Uint8List _makeUint8ListView(Uint8List source, int offsetInBytes, int length) {
   return new Uint8List.view(source.buffer, offsetInBytes, length);
 }