autosize failed sometimes

[ObservedObserver]

I lost the axis title, and sometimes axis tick number or even legend if they are big enough. I think it is casued by failing of autosize.

It might be some reason like data changed but chart failed to auto size for the changed data.

the warning I got

WARN Infinite extent for field "writing score": [Infinity, -Infinity]

It works fine in vega-embed, but fails when I change to react-vega.

{
  "data": {"name": "dataSource"},
  "autosize": {"type": "pad"},
  "mark": "point",
  "selection": {"sl": {"type": "interval"}},
  "encoding": {
    "x": {"field": "math score", "type": "quantitative"},
    "y": {"field": "writing score", "type": "quantitative"},
    "size": {"field": "reading score", "type": "quantitative"},
    "color": {"field": "lunch", "type": "nominal"}
  }
Besides, when I put the dataSource as values in spec props instead of using data props, It works fine.
}

[kristw]

PR merged and published as 7.1.2