fullscreen multiwindow OS X bug?

[db]

On 20 Apr 2017, at 19:21, René J.V. Bertin <rjvbertin at gmail.com> wrote:
> I ran into what looks to be a bug in Apple's fullscreen algorithms. On 10.9.5 with screens DO NOT have separate spaces:
> ...
> Same happens with a Qt-based console emulator so this is not a bug in Terminal.app .

I couldn't reproduce it on 10.8.5. Have you tried switching between the windows using the Window menu or ⌘1, ⌘2, etc?