default client improvement: Moving windows

[shubla]

You shouldn't be able to move any of the in game windows outside of the screen.
There should be a limit that you can only move them like 80% out of the screen, so the 20% would still be visible.
This would make playing easier and confuse players less as they wouldn't accidentally throw their map for example to a place where they cannot see it.

[loftar]

I like being able to put them arbitrarily much outside the screen. On the other hand, they are moved back inside the screen when you toggle their visibility off and back on, which I think most users would habitually try to do if they've lost a window somewhere.