Potential solution is to just reset the app location when opening it.

If that's the plan, we should just remove the window position save/restore code entirely - let the native window manager do its job.

But as this can be a very user-friendly feature - always restoring the window to the right position - I would say we simply mimic WM behaviour. On window create:

1. If size > available (screen) size, shrink
2. If window rect is not contained by available rect, reposition until it is

I just landed this: #848
Thought it was small enough to just push