I used to have two rows of icons in system tray. After performing update to 4.11.6 version of kde-workspace package (package which includes systemtray binary) in Fedora 19, the traybar icons started to scale and remain in a single row instead of being small and stack into two rows like before update. Please fix, this is making the non-tray space in the panel unusably small. Side note: Maybe introducing an option to specify number of expected tray rows in system tray would resolve this once forever?
*** This bug has been marked as a duplicate of bug 330807 ***