Hi NightCabbage,

> Wow, I didn't realise there was a difference.

There isn't supposed to be for a case like that, that's definitely a bug there. I've added it to my list, it should probably not be too hard to fix up.

The click-focused nature of it is so that you can control which of the 2 possible fillets is created for cases like this:



You'll get different results there depending on which side of the intersection point you clicked on when selecting the horizontal line with a click.

When doing a window select it's supposed to automatically pick one (preferring to keep the longer piece if there are different sizes involved if I remember right), and it's not supposed to make any difference when both curves come to a single shared endpoint instead of meeting in a T like above or an X, but something in that part seems to be where the bug is at.

- Michael