I'm trying to use KMail from KDE4, but with XFCE4 panel instead of Plasma panel. So far I get most of the icons from other applications, but no icon from KMail.
It seems it's because KMail uses KSystemNotifierItem, which requires special support from the panel system tray applet, and it looks like XFCE4 panel doesn't support it.
How do I make this work? Is there any way to enable SNI support for XFCE4 panel (if it's not there already)?