The scroll-event of of an AppIndicator (http://developer.ubuntu.com/api/devel/ubuntu-12.04/c/appindicator/libappindicator-app-indicator.html#AppIndicator-scroll-event) is not received by the AppIndicator.

From a higher perspective, I wonder how well AppIndicators are supported in KDE, because for instance the left-click (activate) does not trigger the associated popup menu. I haven't tested, but maybe this has been fixed in Plasma5/plasmashell.

Reproducible: Always

Steps to Reproduce:
1. make sure libappindicator3-1 is installed (with python bindings)
2. run the attached/following script
3. scroll on the AppIndicator (system tray icon)

Actual Results:  
Nothing happens

Expected Results:  
Some output to the console ("SCROLL").

from gi.repository import Gtk, Gdk, AppIndicator3

if __name__ == "__main__":
    menu = Gtk.Menu()
    quit = Gtk.MenuItem("Quit")
    quit.connect("activate", Gtk.main_quit)
    menu.append(quit)
    menu.show_all()

    def scroll(ind, steps, direction):
        print "SCROLL"

    indicator = AppIndicator3.Indicator.new('testscroll', '', AppIndicator3.IndicatorCategory.APPLICATION_STATUS)
    indicator.set_status(AppIndicator3.IndicatorStatus.ACTIVE)
    indicator.set_icon("/usr/share/pixmaps/firefox.png")
    indicator.connect("scroll-event", scroll)
    indicator.set_menu(menu)
    Gtk.main()