Force redraw on updateSize

[dy]

Fixes loosing axes/scale in sequence of toImage.

Test setup:

let list = [
	'gl2d_10',
	'gl2d_12'
]


list.forEach(mock => {
	let div = document.body.appendChild(document.createElement('div'))

	Tabs.getMock(mock, (err, fig) => {

		Plotly.plot(div, fig).then((div) => {
			return Plotly.toImage(div).then(dataUrl => {
				let img = document.body.appendChild(document.createElement('img'))
				img.src = dataUrl
			})
		})

	})
})

Allows to get rid of delay here to speed up serializing.

Reminiscent of https://github.com/plotly/streambed/issues/6307.

@etpinard please take a look, should go well with gl-vis/gl-scatter2d-fancy#5.

[etpinard]

Looking good. I'll test this out in detail tomorrow. Thanks!

[etpinard]

Nicely done. Thanks very much 🍻