Replace deprecated lifecycle componentWillReceiveProps

[evoyy]

This lifecycle method is in the following components:

https://github.com/react-component/slider/blob/master/src/Slider.jsx
https://github.com/react-component/slider/blob/master/src/Range.jsx

We need to replace it in advance of React 17. Depending on how important performance is considered here, we could simply move the logic to componentDidUpdate at the expense of some extra renders.

https://reactjs.org/blog/2018/03/27/update-on-async-rendering.html#migrating-from-legacy-lifecycles

[captbaritone]

It's worth noting that this issue is blocking anyone who is using rc-slider from adopting <React.StrictMode> in the portions of their app which make use of rc-slider.

[afc163]

PR is welcome~

[julien-jean]

I started working on a solution with componentDidUpdate. (see PR : #587 )

There are two points that I'd like to mention:

• setState is not allowed inside componentDidUpdate (eslint rule : react/no-did-update-set-state) so I kinda twisted the pre-commit step to be able to share the code with you, and we'll need to find a way to fix it.
• I've updated the Range.test.js to be fully working but I'm not really convinced we need a TestParent component to ensure the Range is correctly behaving.

[Simbul]

Would you consider a PR that just renames the methods to UNSAFE_componentWillReceiveProps , in order to silence the warnings that come up in React 16.9+ while a proper fix is concocted and applied? I'm happy to produce one if you think it's worth it.

For context, the UNSAFE version of the method has been available since React 16.3 (March 2018).