Since BugFix of
ZK-1368, the html-input-element is 1px too short. The calculation of the width is wrong, when the component has a fixed width. We use box-shadow in CSS for the component, so you can see the bug.
I think the problem is zul.inp.RoundUtl.syncWidth -> if (rightElem && !zk.safari_ && !zk.opera && !wgt._inplace). "wgt" has no attribute "_inplace", only "_inplaceout"??? So "!wgt._inplace" is always true and then the input element is too short.