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- fixes #473
- with frozeen grid, we have 2 horizontal scrolling and if any of the column width on the left section goes over the viewport total width then we completely lose the scrolling on the right section (as described in issue #473)

…ns (#608)

- if we change from a regular grid to a frozen grid dynamically by calling `setOptions({ frozenColumn: 2 })` then it should call `setOverflow` to redo the associated css overflow. This PR does just that and prior to this PR the overflow was just reset and sometime the scrolling was showing up on the left section when it shouldn't