Change trayicon menu position
I suggest to move the trayicon menu position to make it don't cover the icon: look for example to any gnome app, for example rhythmbox or panel applets: if you right-click them, the menu is under (or above) the icon, aligned with the panel, and doesn't cover the icon/applet. This is a small thing, but will integrate gajim even more into gnome (but, yeah, i know it is not a gnome app) :)