i have like a really big problem and i hope somebody can help me with it
so im using GIMP but when i am finished and i add a border to the userbar (sized then 350-19)
i suddenly get two points more so the size turns out to 352-21 i dont know what i do wrong.

Still i always use a 1pixel border
can somebody help its a bit anoying i need to start my userbar at 348-17 so when i am finished i get a 19 userbar and it isnt practical to do.
thanks