Fix bug where selecting a row while filtered would lose all other rows #171
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#170
Before, we would copy all visible rows over with just the modified row having toggled its select. However, when filtered, the visible rows did not include all the filtered-out rows, so they would be lost.
Now we keep an internal ID on all rows. This may also be useful in the future, but it's particularly useful to allow us to find the selected row and toggle its selection directly in the underlying row structure. This is also quicker and requires less copying, which is a bonus, despite being a simple linear search.