Don't calculate sizes for Box that has Box children

[saitonakamura]

Fixes #56

[talentlessguy]

would like to merge but asking in case, did you test the PR locally?

[saitonakamura]

Yes, I tested it on a case from codesandbox and on the bunch of stories in storybook (I use that PR I've opened). Now that you've mentioned it I also checked the example and it's not working, but it's also not working for me locally in master

[saitonakamura]

Error is

Failed to compile.

./src/index.js
Error: Duplicate plugin/preset detected.
If you'd like to use two separate instances of a plugin,
they need separate names, e.g.

  plugins: [
    ['some-plugin', {}],
    ['some-plugin', {}, 'some unique name'],
  ]

Duplicates detected are:
[
  {
    "alias": "/Users/saitonakamura/code/react-three-flex-copy/examples/node_modules/react-refresh/babel.js",
    "dirname": "/Users/saitonakamura/code/react-three-flex-copy/examples",
    "ownPass": false,
    "file": {
      "request": "/Users/saitonakamura/code/react-three-flex-copy/examples/node_modules/react-refresh/babel.js",
      "resolved": "/Users/saitonakamura/code/react-three-flex-copy/examples/node_modules/react-refresh/babel.js"
    }
  },
  {
    "alias": "/Users/saitonakamura/code/react-three-flex-copy/examples/node_modules/react-refresh/babel.js",
    "dirname": "/Users/saitonakamura/code/react-three-flex-copy/examples",
    "ownPass": false,
    "file": {
      "request": "/Users/saitonakamura/code/react-three-flex-copy/examples/node_modules/react-refresh/babel.js",
      "resolved": "/Users/saitonakamura/code/react-three-flex-copy/examples/node_modules/react-refresh/babel.js"
    }
  }
]
    at cachedFunction.next (<anonymous>)
^C

when you run yarn start in examples, so I'm pretty sure it's not my changes that broke it

[talentlessguy]

my bad I've updated react-scripts so this is the cause

[talentlessguy]

also i'll merge the storybook pr as well

[talentlessguy]

done. both pr merged @saitonakamura :P

[saitonakamura]

Yay thanks! This really helps (we're developing a ui for a vr so flex engine is pretty much a must have)