Bug#805837: close-cross doesn't work on mion package manager

[Agnès Louvrier <agnes.louvrier@sfr.fr>]

Package: <muon-common>
version: last
Language: French
KDE plasma: 5.4.2
Environnement: stretch Qt: 5.5.1
Kernel: 4.2.0-1-amd64
64-bits

Hello/Bonjour/Guten morgen/...

Reportbug doesn't work. I give to you a small bug that I suppose easy to
repare.
ONLY ON "Gestionnaire de paquets Muon" (Muon Package Manager) KDE5
Stretch Fr-fr last update.
The close-cross on window title becomes red when clicked but is another
time white after without closing anything. Maximize and minimize are
working.
As attempted, the application should be closed when you clic on this
close-cross, but you can quit the app with File>quit.

Thank you/Merci beaucoup/Vielen danke

Best regards/Bien cordialement/Beste grüss Jeanne -- Cordialement

Agnès Louvrier 0381395657