Two children with the same key warning when using row, lazyLoading and infinite.

[houkanshan]

Checkout this codesandbox:
https://codesandbox.io/s/k5k9q6q07o

The setting is:

const setting = {
  slidesToShow: 1,
  slidesToScroll: 1,
  infinite: true,
  lazyLoad: true,
  row: 1,
  slidesPerRow: 4
};

Also when switch to last page, it will suddenly change to the first page, and the last item will drop to the second line in first page:

---

EDIT: The two same keys are generate by getKey in track.js

https:/akiran/react-slick/blob/master/src/track.js#L86

One is from child.key, the other is fallbackKey.
Simply change the fallbackKey to be something like 'fallback-' + fallbackKey can fix it. But I'm not sure if this is the right way.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[lioryemini]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

This issue also occurred to me, and the solution above solve it.
Can we add it to next version fix?

[lioryemini]

The setting is:

const setting = {
  slidesToShow: 1,
  slidesToScroll: 1,
  infinite: true,
  lazyLoad: true,
  row: 1,
  slidesPerRow: 4
};

@houkanshan I've re-opened this bug as a new issue #1987 . Hopefully this will be fixed.
thanks for reporting it.