See attachment. Clementine does have its own icon and there is a breeze icon. It could be a kmix bug, please reassign if I'm wrong. Reproducible: Always Steps to Reproduce: 1. Try to change the volume of clementine.
Created attachment 100498 [details] screenshot
is clementine now a oficial part of KDE? I can do that app icon sure
I have no idea of clementine's affiliations. I just know there is such an icon in breeze and breeze-dark
The main criteria used to be apps that are part of KDE, and a few other I did for fun, its debatable if we should do app icons for apps outside the KDE space, mostly because its might be a violation of the individual apps "brand" say for Gnome file manager we would do an ugly icon that looked like a banana, in that case the app developers in gnome would think with good reason that we were being rude and going out of our way to make their app look bad in a KDEPLasmaDesktop space. I'm sure this is not the case with clementine nor will it be, in the cases were I did make an icon for an non KDE app I tried to be respectful of the app core brand values... having said that there might be a bug in kmix as if there is no icon it should use the one the app ships by itself in I think highcolor folder
I reassigned to kmix then.
KMix now obtains the application icon, whether it is a "KDE application" or not, by asking for its desktop file via DBus. There are some fallback icon names for those applications which don't provide a desktop file or icon name, but Clementine provides this information and KMix shows the application icon correctly. Implemented by commit 793c07f3.