dojox/grid/_Grid::defaultUpdate() recursion error

[jmrkr]

I think I found a bug in dojox/grid/_Grid::defaultUpdate() that leads to a recursion error.

I posted about it in the forums here, seeking a potential better solution (perhaps using beginUpdate/endUpdate would be better?):
https://discourse.dojo.io/t/bug-in-dojox-grid-grid/436

Basically, because defaultUpdate() doesn't flag itself as 'updating', it can continue to be called by dojox/grid/_View::hasVScrollbar() which then eventually calls hasVScrollbar, and on and on .

I've only been able to reproduce the issue when the grid contains 7 rows - for whatever reason.