Comment 21 for bug 331311

Also of note as to why I suggested what I did is that most of the
notification-* icons are not being shipped in the notify-osd package.
They are in human-icon-theme package. If they are added to the
notify-osd package itself, then putting them in hicolor like other
apps do would probably be the best route. I could provide a patch
doing that, but it would mean adding quite a few files to notify-osd.
Either way, it would be nice if someone from the dx-team would