Dom update race

[amahdy]

This need a very special setting to reproduce:

• From the demo, take any Grid example and implement it in a test page.
• Change the grid to be a bit longer. (Optional, to make reproduction easier).
• Open developer tools and inspect the grid, select any DOM let say "tbody". (Dev tools here is to visualize the issue).
• Now make sure that developer tools window is pinned to the bottom of the page, resize it a bit up till it almost reaches the bottom of the grid.

Result: The DOM elements of the grid are getting frequently and rapidly updated and overload the browser.