Copy a range of cells and paste it into another range, extending the target range if it is too small.

[qiufeihong2018]

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[Michota]

We already were asked about it not so long ago. We don't plan to add this feature in v4. Though we will think about adding this behavior to v5 of ReactGrid.
If your data overflows the grid, you can handle this behavior outside of ReactGrid, in your own function.
But if you are interested to add feature like this to your project that depends on ReactGrid, I suggest you to create a fork, or implement it by yourself by using something like PatchPackage.