Downstream report: https://bugs.launchpad.net/ubuntu/+source/xfce4-pulseaudio-plugin/+bug/1769775
1. Add more than one xfce4-pulseaudio-plugin to the panel. (For example, because you have a panel on more than one monitors and a plugin on every panel.)
2. Adjust the volume.
You get a bubble for every instance of the plugin. If you have three plugins, the volume notification will be displayed three times.
DistroRelease: Ubuntu 18.04
Package: xfce4-pulseaudio-plugin 0.4.1-0ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
Date: Tue May 8 00:55:38 2018
InstallationDate: Installed on 2018-05-07 (0 days ago)
InstallationMedia: Xubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
UpgradeStatus: No upgrade log present (probably fresh install)
Just to add some context: all the bubbles appear stacked on the same monitor. (Last time I checked anyway.)
They should either be one per monitor or preferably just one on the current monitor. I'm not sure if the former is possible as the notifications seem to follow the mouse pointer.
Here's the screenshot: https://bugs.launchpad.net/ubuntu/+source/xfce4-pulseaudio-plugin/+bug/1769775/+attachment/5135701/+files/volue.png
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