Sometimes some icons in the tray area (bottom right in the panel) are hidden and there is a gap. Sometimes they appear after killing and relaunching plasmashell and sometimes other icons disappear. On my laptop the volume control often disappears, on a firend's laptop the network icon disappears. Reproducible: Sometimes
Created attachment 96769 [details] The missing tray icons are highlighted
Sorry, it's a dup of bug 352055 *** This bug has been marked as a duplicate of bug 352055 ***