The problem occurs when I type in an exact pixel dimension for my viewport size. I want the adjacent viewport to get bigger (or smaller) by the same amount, and do it cleanly. But, I get this this annoying hole. Not always, but most of the time. [See pic]
FYI : I understand that I can drag the common border, but I need an exact size of viewport for rendering purposes. Secondly, I know you can make a floating viewport, but that is not working well for the demo I am recording.