* `{@link #numFromEdge}` rows of the grid viewport, if the required rows are available in the Store,// TableView's getViewRange delegates the operation to this method if buffered rendering is present.// New start index should be current start index unless that's now too close to the end of the store// We only have to bump the table down by the height of removed rows if rows are not a standard size// We only have to bump the table down by the height of removed rows if rows are not a standard size