Disable overlay scrollbars by default in Xubuntu 13.10

[Thaddaeus Tintenfisch]

Overlay scrollbars should get deactivated during the Xubuntu session despite the actual user setting. The user should still be able to reactivate them if needed.

Possible solution (add to /etc/X11/Xsession.d/ or xinitrc):
if [ x"$DESKTOP_SESSION" = x"xubuntu" ]; then
    export LIBOVERLAY_SCROLLBAR=0
fi

Disabling them fixes some minor GTK3 theme glitches and these bugs:
bug 1048805 xfce4-appfinder launches very slowly
bug 1236271 GTK3 applications do not react to scroll wheel input when overlay scrollbars are activated
bug 1239014 xfsettingsd unable to daemonize properly when overlay scrollbars are activated

[Thaddaeus Tintenfisch (thad-fisch-deactivatedaccount)]

On top of that, the normal Xfce session should be added to the list too.

[shuerhaaken (shkn)]

I had issues with xfce4-power-manager sometimes not starting.

Adding the following helped (as in the first comment):

if [ x"$DESKTOP_SESSION" = x"xubuntu" ]; then
    export LIBOVERLAY_SCROLLBAR=0
fi

export DESKTOP_SESSION

Overlay scrollbars seem to be a problem. Unfortunately, as I like them very much.

[Alejandro Mery (amery)]

still needed in 14.04