Icons are big when panel placed vertically. Kicker icon is scaled with panel that makes panal unusable with bigger width (first screenshot), system tray icons are big and as a consequence they are placed vertically instead of creating horizontal rows. KDE4 implementation is correct. Reproducible: Always Expected Results: KDE4 behavior.
Created attachment 91360 [details] Big Kicker icon
Created attachment 91361 [details] Big systray icons
Created attachment 91363 [details] Vertical panel in KDE4
Thanks *** This bug has been marked as a duplicate of bug 343349 ***