Adjustments to character positions less than one pixel are ignored.
These adjustments are probably introduced by lossy conversions between
integer based and float based coordinates. 

Change-Id: Ie4506658aba7bb3e2b211817568676b099afef03
Reviewed-on: https://gerrit.libreoffice.org/15539Reviewed-by: Norbert Thiebaud <nthiebaud@gmail.com>
Tested-by: Norbert Thiebaud <nthiebaud@gmail.com>