After a day of sitting on this I decided to throw out the AbstractDataProvider implementation I wrote and modify my Activity to handle RangeChangeEvents itself. Then I manually update the display myself through accessor methods of the view implementation. Perhaps it was always meant to be this way I just didn't glean as much from the documentation even though there is clearly a section on custom data providers here<https://developers.google.com/web-toolkit/doc/latest/DevGuideUiCellWidgets#custom-data-provider>. I believe this approach to be the cleanest so far.
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