[Bug]: If DataGrid is used with paginated data, aria-rowcount is set to first page size and incorrect and there is no way to change it

[DarynaAkhmedova]

We use DataGrid component with the paginated data. When first page is loaded, DataGrid aria-rowcount is set to first page size. However, based on the docs: "the aria-rowcount attribute defines the total number of rows in a table, grid, or treegrid".

When we try to set aria-rowcount attribute "manually" as a DataGrid prop, it is not updated.

We could also use another approach, where by adding hidden rows to the bottom of DataGrid, we would get correct aria-rowcount, but it affects scroll of the grid. DataGrid reserves the place for those hidden rows based on the itemSize property of the data grid:

Is there any other way to fix it? If not, could you please accept aria-rowcount as a property or suggest any other solution?

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