                                daemon=True)
          self._thread.start()
          logger.debug("Initializing %s", self.__class__.__name__)
  
      @property
      def trigger(self) -> Event:
          """ :class:`threading.Event`: The trigger to indicate that a patching run should
          commence. """
          return self._trigger
  
      @property
      def converter(self) -> Converter:
          """ :class:`lib.convert.Converter`: The converter to use for patching the images. """
          return self._converter
  
 
</s> remove     def _available_masks(self) -> List[str]:
        """ list: The mask names that are available for every face in the alignments file """
        retval = [key
                  for key, val in self._samples.alignments.mask_summary.items()
                  if val == self._samples.alignments.faces_count]
        return retval
 </s> add     def config_tools(self) -> "ConfigTools":
        """ :class:`ConfigTools`: The object responsible for parsing configuration options and
        updating to/from the GUI """
        return self._config_tools

    @property
    def dispatcher(self) -> "Dispatcher":
        """ :class:`Dispatcher`: The object responsible for triggering events and variables and
        handling global GUI state """
        return self._dispatcher

    @property
    def display(self) -> FacesDisplay:
        """ :class:`~tools.preview.viewer.FacesDisplay`: The object that holds the sample,
        converted and patched faces """
        return self._display

    @property
    def lock(self) -> Lock:
        """ :class:`threading.Lock`: The threading lock object for the Preview GUI """
        return self._lock

    @property
    def progress_bar(self) -> "BusyProgressBar":
        """ :class:`~tools.preview.control_panels.BusyProgressBar`: The progress bar that indicates
        a swap/patch thread is running """
        assert self._cli_frame is not None
        return self._cli_frame.busy_progress_bar

    def update_display(self):
        """ Update the images in the canvas and redraw """
        if not hasattr(self, "_image_canvas"):  # On first call object not yet created
            return
        assert self._image_canvas is not None
        self._image_canvas.reload() </s> remove                               args=(self._trigger,
                                    self._shutdown,
                                    self._queue_patch_in,
                                    self._samples,
                                    tk_vars),
 </s> add                               args=(self._queue_patch_in,
                                    self._app.dispatcher.needs_patch,
                                    app._samples),
                                daemon=True)
          self._thread.start()
          logger.debug("Initializing %s", self.__class__.__name__)
  






      @property
      def converter(self) -> Converter:
          """ :class:`lib.convert.Converter`: The converter to use for patching the images. """
          return self._converter
  
keep keep keep keep replace replace replace replace replace replace keep keep keep keep keep
 bugfix:
    - preview tool - Prevent tkinter variables from exiting main thread
refactor:
    - preview tool - Split module to smaller sub-modules + docs, locales
Typing:
    - tools.preview.cli
Unit test:
    - tools.preview.viewer 
tools/preview/preview.py