Make the item heights rounded to avoid font rendering issues
Summary:
Fixes small font rendering issues produced by items which are offset by
half a pixel because of multiplying gridUnit with 2.5. This is especially
noticeable with bitmap fonts where parts of the letters are missing.
Reviewers: mart, davidedmundson, broulik, ngraham
Reviewed By: davidedmundson, ngraham
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D11502