This is action item #3 from https://phabricator.kde.org/T9444#160267 Bug 398742 requests new opaque backgrounds for the large sized power-related icons in system.svgz. This will look better in all places except for as the icon used for Kickoff's Leave tab. To make sure we don't regress that, let's create a new icon for that in system.svgz with a new name that's identical to the existing icon. If we do this quickly, we'll have 4-5 months to notify the 3rd-party icon themes so that they can adapt accordingly before Plasma 5.15 is released (probably most can just symlink an existing icon). I'm open to other ways of resolving the problem if the approach proposed here isn't a good idea.
We've implemented QML circles, I think that covers this?
Yep.