avant-window-navigator startup in gnome/XFCE only

echo "[Desktop Entry]
Type=Application
Name=Avant Window Navigator
Comment=A dock-like window navigator.
Exec=avant-window-navigator
Icon=/usr/share/avant-window-navigator/avant-window-navigator-48.png
Categories=GNOME;Utility;
X-Ubuntu-Gettext-Domain=avant-window-navigator
OnlyShowIn=GNOME;XFCE;" | sudo tee /usr/share/applications/avant-window-navigator.desktop