Bug#907593: Buster: LXQT: No feedback when an app is launched

[local10]

Installed LXDE for comparison so more info:

1. LXDE does provide provide feedback when apps are launched.
2. LXDE launches and shutsdown apps a lot quicker than LXQT does. The 
difference is very noticible (2-3 seconds for LXQT in some cases, e.f. Firefox, 
compared to a fraction of a second for LXQT).  Regards,