xfce4-pulseaudio-plugin: Control with multimedia keys

[Paul Menzel]

Dear Xfce folks,


We moved from Xfce4-mixer to Xfce4-pulseaudio-plugin 0.4.1 and it 
basically works in the standard configuration.

Judging from the change-log of the 0.4.0 release, I hoped that 
multimedia buttons would work.

> - MPRIS2 integration: playback controls, multimedia keyboard
> integration, and playlist support

But pressing the keys on the keyboard here, they generate the events, 
but the volume remains unchanged.

```
KeyPress event, serial 37, synthetic NO, window 0x2e00001,
     root 0x117, subw 0x0, time 1729987027, (-260,154), root:(1571,1154),
     state 0x0, keycode 122 (keysym 0x1008ff11, XF86AudioLowerVolume), 
same_screen YES,
     XLookupString gives 0 bytes:
     XmbLookupString gives 0 bytes:
     XFilterEvent returns: False

KeyRelease event, serial 37, synthetic NO, window 0x2e00001,
     root 0x117, subw 0x0, time 1729987259, (-260,154), root:(1571,1154),
     state 0x0, keycode 122 (keysym 0x1008ff11, XF86AudioLowerVolume), 
same_screen YES,
     XLookupString gives 0 bytes:
     XFilterEvent returns: False
```

Does something need to be configured additionally to get multimedia 
keyboards integrated?


Kind regards,

Paul


PS: Please tell me, if I should report these issues to the bug tracker 
instead.

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