anchor.diff:        _aceEditor.session = ace.createEditSession('', new ace.Mode('ace/mode/text'));
         _aceEditor.readOnly = true;
       } else {
  -
  -      if (!filenameBySession.containsKey(session)) {
  -        String filename = file == null ? 'no file' : file.name ;
  -        print("Haven't seen this session before.  I will call you '${filename}'");
  -        filenameBySession[session] = filename;
  -      } else {
  -        print("Ah, session ${filenameBySession[session]} again ...");
  -      }
  -
         _aceEditor.session = session;
   
         if (_aceEditor.readOnly) {
  
positive.code: 
    ace.EditSession get currentSession => _aceEditor.session;
  
    // TODO(ericarnold): Deleteme.  testing
    static Map<ace.EditSession, String> filenameBySession = {};
  
    void switchTo(ace.EditSession session, [workspace.File file]) {
      if (_foldListenerSubscription != null) {
        _foldListenerSubscription.cancel();
  
negative.code:   }
  
    void _handleMarkerChange(workspace.MarkerChangeEvent event) {
      if (event.hasChangesFor(currentFile)) {
        setMarkers(currentFile.getMarkers());
      }
  