docs: @CheckForNull
      protected AbstractMarkerAnnotationModel getModel() {
          if(editor == null) {
              return null;
          }
          IDocumentProvider provider = editor.getDocumentProvider();
          IAnnotationModel model = provider.getAnnotationModel(editor.getEditorInput());
          if (model instanceof AbstractMarkerAnnotationModel) {
              return (AbstractMarkerAnnotationModel) model;
          }
          return null;
      }