[BUG] Incorrect reaction to `pageProvider` change

[zumm]

See demo. Try to select collection B without scrolling. New items will not be rendered.

I think it happens because length and pageProvider are changing at same time and pipeline can't handle it correctly.

[mesqueeb]

we've seen the same issue, let us know if we can help providing another reproduction

[rocwang]

Thanks for the bug report. I can confirm it from my side. Will get it fixed.

[github-actions]

🎉 This issue has been resolved in version 1.7.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[rocwang]

This has been fixed in v.1.7.1.

I verified the fix by updating the provided demo with "vue-virtual-scroll-grid": "1.7.1". See https://codesandbox.io/s/optimistic-bush-j77bjn?file=/package.json:239-273