Hi,

I just discovered that the addGridLayout isn't compatible with addHiddenColumns.

You can see the problem by trying to hide columns in this example: https://svelte.dev/repl/3c2e3375c82748c0941699e4f427c0a7?version=3.48.0

I think hidden columns are not taken into account when calculating the number of columns here.

I'll try to create a pull request to correct this issue 🤞.

Best regards,
Stéphane