It’s a quick note for anyone coming from search. If you’re not using a full-featured DE, rather something as simple as i3, or Awesome, or XMonad, or Fluxbox, or anything else not including bells’n’whistles; and you’ve missing or wrong icon of klipper/kmix in bar(and, probably, some other Qt apps), then you’ve to set
XDG_CURRENT_DESKTOP="xfce" for those apps.
E.g. I’m using i3, and have the variable set to “kde” (for dolphin, and likes), so I’m just autostarting
The reasons is probably that those DEs provides some API which applets expect to use. Using
"xfce" variable in the case of absent DE is fine though.