Change grid animation to not grey out already cached rows, just because it fetches new ones.
- First, the global animation is disabled, because it really shows the progress while an ajax request is active, so we cannot use this method any more if we want to solve the OP.
- Then, the individual rows are animated with CSS3, so it's only the new rows that will fade in a similar manner as previously.
This animation will not work on IE<10 so older IE will just show the rows instantly and not animate them.