Allow for fixed column

It would be great to have a feature to fix a column at the left of the grid and the rest of the grid would scroll horizontally while the left fixed column would remains fixed.

If you give me the pointer of how to do it I can help to create this feature.

Regards,

Augusto

No files, tests, or entry points are named. Start by locating the grid's layout and horizontal-scrolling implementation in the repository, then determine how a left column can remain fixed while the remaining grid scrolls. Done means the fixed column stays visible during horizontal scrolling and the behavior is covered by appropriate tests.

Written by the indexing model from the issue text.