Comment 51 for bug 1335492

Hi,
Regarding the patch seems correct, it is a change that I think necessary, (In my taste just missing rename the cache file to contain the grid size instead desktop size).

However, in any case, please leave open the bug!.
It is very difficult to prove, and in the tests that I did, seems to work,. but the bug is very sporadic to ensure on 100% that the patch fix it.