Confirm this works, that used to be really annoying, thanks.

It's still not perfect; I have "Minimize windows into application icon" enabled, and if you minimise the window then click on the app dock icon it doesn't un-minimise it whereas other apps do. You need to select Show/Hide from the menu to see it again with Bitcoin-QT. But at least it's not possible to get stuck in a situation where you can't see the UI anymore.