I'd bet this is (was) a known sub-pixel issue.
Newer browser returns pixel values as double
rather that int
on DOM operations, events and such. This is why you are seeing those messages.
As the warning states, the retuned double
value is rounded to the nearest int
and shouldn't likely be a problem per se (but logging tons of those messages might be). GWT 2.6 holds a proper fix for that, so your may want to upgrade, workaround (as in the patch), or simply ignore it.