Zone selector spinbutton last changes was wrong (bad button creation). This fixes this and also forces "0" digits precision to match "int" type.
Zone selector spinbutton last changes was wrong (bad button creation).
This fixes this and also forces "0" digits precision to match "int" type.

umn-smr/libzbc,fenggangwu/libzbc,fenggangwu/libzbc,umn-smr/libzbc