User widgets / plasmoids can contain a custom icon in their contents/ folder, by specifying in their metadata.json file an icon with a leading "/" such as: "Icon" : "/lightstrands.png", and embedding the icon in their /contents folder. However, this fails to display the icon properly when debugging the plasmoid in the plasmoidviewer app, & viewing the AboutPlugin.qml config page. (see also https://bugs.kde.org/show_bug.cgi?id=509896) In the previous bug, we could assume a standard install directory, but here we'll need to consider the value of the "-a" applet parm.