Comment # 35 on bug 1037891 from Fabian Vogt

(In reply to Josef Reidinger from comment #31)
> OK, now I do some debugging here is result:
> 
> 1. in gnome it looks ok for me. I see icon, but it is not properly grouped.
> 
> 2. passing name was more tricky then I though, as there is no simple way to
> modify it in y2start. But I can pass it to y2start from other script we have
> there, but at least in gnome it does not help with grouping. Still I see two
> different windows there.
> 
> I do not have at hand KDE, so if you can test how it will look like if you
> call
> 
> /usr/lib/YaST2/bin/y2start <module e.g. bootloader> qt -name YaST2
> 
> and test it if it helps at least in KDE. I see that change is
> 
> WM_CLASS from "ruby", "YaST2 bootloader @ dhcp77" to "YaST2", "YaST2
> bootloader @ dhcp77"

Grouping works fine, but the icon is still missing. Appending "-icon yast" to
y2start as well fixes that.

Note that for wayland support qApp->setDesktopFileName("YaST") needs to get
called on startup as native.

I had a talk with a KDE Plasma developer, he told me that the *second* field of
the WM_CLASS is important for connecting windows to applications.
Qt gets that from QCoreApplication::applicationName(), so need to call
setApplicationName with "YaST2" and not the window title.