Tweaked cross-staff glissando

[Antti Kaihola]

Hi LilyPonders,


On a piano staff, I need a glissando line from a quarter note on last
beat of the upper staff to a note on the first beat of the lower staff:

\context PianoStaff <<
    \context Staff=upper {
        r2. c''4 \glissando \change Staff = lower d4 r2.
    }
    \context Staff=lower {
    }
>>

However, I'd like to glissando line to end horizontally just before the
barline so one doesn't get the impression that the last notes of the
glissando are after the first beat.

Is there an easier way to achieve this than to insert additonal spacing
and move the barline?