Created attachment 850733 [details]
missing badges on openSUSE tumbleweed (bottom), present badges on kubuntu (top
screenshot)

For apps in the task manager panel (icons only) in KDE's Plasma desktop
environment (5.22.2) there are no unread items badges available if that app is
based on the electron framework.
In Plasma's system settings (Notifications > Configure Apps) I can only
configure 'native' KDE apps and for 'other apps' the badge option is always
greyed out.
Another linux KDE distro (kubuntu in this case) manages to include other apps
in the list of configurable apps and shows badges on the task manager app
icons. Possibly due to the availability of libunity in that system, which is
not readily available for openSUSE Tumbleweed (packages found here do not
install or are broken: https://software.opensuse.org/package/libunity).