Graph config defaults don't match plotly.js

[alexcjohnson]

Graph sets its own config defaults here - but this has no mechanism to keep up to date with plotly.js, and in fact it's out of date already in at least one respect, scrollZoom, as of plotly/plotly.js#3422

We should either remove those defaults entirely, or programmatically match them to plotly.js.

There's a related problem: if you override a piece of the config, the rest of the default gets dropped. So for example right now if you were to set something unrelated like showLink: true, the scrollZoom: false would be dropped - and set to the new plotly.js default!

cc @nicolaskruchten @michaelbabyn - discovered while researching plotly/plotly.js#3738

[nicolaskruchten]

Cc @wbrgss

[alexcjohnson]

Did a little investigation of the current Graph.defaultProps values vs plotly.js:

• Only one value is provided but does NOT match plotly.js, the aforementioned scrollZoom.
• A whole bunch of entries aren't present at all:
  • plotlyServerURL
  • responsive
  • showSendToCloud
  • toImageButtonOptions
  • watermark
  • setBackground
  • logging
  • globalTransforms
  • locale
  • locales

For the moment I'll make a PR to remove the defaults and add documentation for the new entries. Later - unless it's quick and I can get it in for the upcoming release - I'll make another PR to test that these keys continue to match when we upgrade plotly.js.

[alexcjohnson]

Actually I'm not going to include setBackground, logging, or globalTransforms - these either won't work or aren't serializable, if you wanted to use them you'd need to subclass Graph.

[alexcjohnson]

Closing - #515 fixes the bug by removing the nested defaults, and includes a test that propTypes for Graph has the right keys from the plotly.js schema.