anchor.diff:        // editor itself
         editor.on("paste", handlePasteEvent);
         editor.on("copy", handleCopyEvent);
  -
  -      //session
  -      session.on('annotationRemoval', handleAnnotationRemoval);
  -      session.on('annotationChange', handleAnnotationChange);
   
         // listener for autosave
         session.on("change", function (deltaObject) {
  
positive.code:       session.setUseWrapMode(true);
  
        var file_id =  $(element).data('id');
        //setAnnotations(editor, file_id);
  
        /*
         * Register event handlers
  
negative.code:           exercise_id: $('#editor').data('exercise-id'),
            files_attributes: (filter || _.identity)(collectFiles())
          },
          annotations_arr: []
        },
        dataType: 'json',
        method: 'POST',
  