You can set the join and end caps separately. So you could make the left/bottom line have a round join (corner), but with butt or square end cap. Is that what you want? That's what I was expecting but my second image is with those settings (round join, square end cap) but for some reason it puts ro...

Hey, I'm working on an image and right now I have it as follows: http://i.imgur.com/OOfUkDw.png So a bunch of lines with square cap ends. The bottom left corner I want it to be curved/rounded. From searching I got the impression the best approach is to join those lines (Path -> Union is what I've do...