Hi
I often (but not always) use my laptop together with an extra bigger screen and I usually put SE on that screen. SE remembers this which is nice when the screen is there. However, SE also remembers this when the screen isn't there, i.e., when I am away from my office which is not so nice.
On Windows I do have the possibility to move the mislocated window to the laptop screen. But if there is a way to do that in Ubuntu I have yet to find it. In either case it is a hassle.
So I would like SE to be better at detecting whether a secondary is present or not, and if not, open on a screen that is present.