Default to go.FigureWidget in notebooks

[marthacryan]

the FigureWidget class has more features than the Figure class without any major downsides (that we know of?) - we should consider defaulting to using the widget. One thought is that we could default to using it if anywidget is already installed.

[ndrezn]

I am curious if using AnyWidget gives us more control over the version of Plotly.js we bundle, which possibly means we could use this strategy to fix #4827

[slishak-PX]

the FigureWidget class has more features than the Figure class without any major downsides (that we know of?)

One downside is that FigureWidget does not fully support animations.

plotly.py/packages/python/plotly/plotly/basewidget.py

Lines 786 to 800 in 31b3ad8

	@staticmethod
	def _display_frames_error():
	"""
	Display an informative error when user attempts to set frames on a
	FigureWidget
	Raises
	------
	ValueError
	always
	"""
	msg = """
	Frames are not supported by the plotly.graph_objs.FigureWidget class.
	Note: Frames are supported by the plotly.graph_objs.Figure class"""
	raise ValueError(msg)

[marthacryan]

@slishak-PX Thank you for that comment! That's really helpful to know.

[ndrezn]

Another potential problem with this approach is that FigureWidget probably isn't compatible with Dash, and because Dash runs in Jupyter, we'd need to figure out a clever solution on whether to render a FigureWidget outside Dash or a Figure for Dash.

Not insurmountable though!