          The variable that holds the value from the scale combo box
      screen_dimensions: tuple
          The (`width`, `height`) of the displaying monitor
      """
      def __init__(self,
                   parent: tk.Frame,
                   scale_var: tk.StringVar,
                   screen_dimensions: Tuple[int, int],
 
</s> remove                  screen_dimensions: Tuple[int, int]) -> None:
 </s> add                  screen_dimensions: Tuple[int, int],
                 is_standalone: bool) -> None: </s> remove     is_standalone: bool
        ``True`` if preview is a pop-up window otherwise ``False``
 </s> add     taskbar: :class:`tkinter.ttk.Frame` or ``None``
        None if preview is a pop-up window otherwise ttk.Frame if taskbar is managed by the GUI </s> remove     def __init__(self, parent: tk.Frame, is_standalone: bool) -> None:
        logger.debug("Initializing %s (parent: '%s', is_standalone: %s)",
                     self.__class__.__name__, parent, is_standalone)
        super().__init__(parent)
 </s> add     def __init__(self, parent: tk.Frame, taskbar: Optional[ttk.Frame]) -> None:
        logger.debug("Initializing %s (parent: '%s', taskbar: %s)",
                     self.__class__.__name__, parent, taskbar)
        self._is_standalone = taskbar is None
        self._gui_mapped: List[tk.Widget] = []
        self._frame = tk.Frame(parent) if taskbar is None else taskbar

    is_standalone: bool
        ``True`` if the preview is standalone, ``False`` if it is in the GUI
          The variable that holds the value from the scale combo box
      screen_dimensions: tuple
          The (`width`, `height`) of the displaying monitor
    is_standalone: bool
        ``True`` if the preview is standalone, ``False`` if it is in the GUI
      """
      def __init__(self,
                   parent: tk.Frame,
                   scale_var: tk.StringVar,
                   screen_dimensions: Tuple[int, int],
keep keep add keep keep keep keep keep
 GUI - Preview updates
  - Training preview. Embed preview pop-out window
  - Bugfix - convert/extract previews 
lib/training/preview_tk.py