HTML Widgets; Grid; Does not retain visible state of hidden rows after VirtualDataRefresh method is called

If a Grid (widget.UI.Grid) has hidden rows, a light yellow bar appears below the grid which can be clicked to toggle the visible state of these hidden rows.

However, if widget.UI.Grid.VirtualDataRefresh was called to redisplay the grid data and hidden rows were visible, they would be hidden again but the caption on the yellow bar was not updated.

Calling VirtualDataRefresh now retains the visible state of hidden rows.

This could be seen on the "Merge Options" page of the "Combine Clients" widget by doing the following:
* Click the light yellow bar to show hidden rows
* Click the button to "Select all valid rows"
* Click the "Check selected row(s)" button