I've upgraded the packages unity, libunity-core-6.0-9 and unity-services to the version in trusty-proposed (7.2.6+14.04.20151021-0ubuntu1).
The bug seems to be fixed!
I followed the Test Case with 2 Terminal windows, and then with 2 Nautilus windows, and the windows kept their decorations/title bars.
I also noticed that the decorations no longer vanish during the fade out animation.
I've upgraded the packages unity, libunity-core-6.0-9 and unity-services to the version in trusty-proposed (7.2.6+ 14.04.20151021- 0ubuntu1) .
The bug seems to be fixed!
I followed the Test Case with 2 Terminal windows, and then with 2 Nautilus windows, and the windows kept their decorations/title bars.
I also noticed that the decorations no longer vanish during the fade out animation.