Make sure that no decrypted text gets stuck in the plaintext buffer

sdk/lib/io/secure_socket.dart

 // Copyright (c) 2013, 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.
 
 part of dart.io;
 
 /**
  * A high-level class for communicating securely over a TCP socket, using
  * TLS and SSL. The [SecureSocket] exposes both a [Stream] and an
  * [IOSink] interface, making it ideal for using together with
@@ skipping 386 matching lines @@
       Timer.run(() => _controller.add(RawSocketEvent.WRITE));
     } else {
       _writeEventsEnabled = value;
     }
   }
 
   bool get readEventsEnabled => _readEventsEnabled;
 
   void set readEventsEnabled(bool value) {
     _readEventsEnabled = value;
-    if (_socketClosedRead) {
-      if (value) {
-        // We have no underlying socket to set off read events.
-        Timer.run(_readHandler);
-      }
+    if (value &&
+        ((_secureFilter != null &&
+          _secureFilter.buffers[READ_PLAINTEXT].length > 0) ||
+         _socketClosedRead)) {
+      // We might not have no underlying socket to set off read events.
+      Timer.run(_readHandler);
     }
   }
 
   List<int> read([int len]) {
     if (_closedRead) {
       throw new SocketIOException("Reading from a closed socket");
     }
     if (_status != CONNECTED) {
       return null;
     }
@@ skipping 325 matching lines @@
   void destroy();
   void handshake();
   void init();
   X509Certificate get peerCertificate;
   int processBuffer(int bufferIndex);
   void registerBadCertificateCallback(Function callback);
   void registerHandshakeCompleteCallback(Function handshakeCompleteHandler);
 
   List<_ExternalBuffer> get buffers;
 }