Separate the movement of the header and item in the grid.

Hi, I need your help.

The grid header is the first item in the VirtualisedList.

And the VirtualisedList acts like a grid, because of the isGrid flag.

So when the focus of the header moves left or right, the focus of the first row of the grid moves with it.

This is uncomfortable if the buttons in the header are smaller than the items in the first line.

Is there a way to separate the header behaviour from the grid behaviour?

Thank you.

Start by tracing the VirtualisedList entry point and the isGrid handling described in the issue, then inspect how horizontal focus movement is shared between the header and first grid row. Done means header movement is independent from the first row while grid-item navigation remains unchanged; add or update coverage for both behaviors if the relevant tests are found.

Written by the indexing model from the issue text.