bug? pitch affects collision accidental and barline

[Paco Vila]

Hello. I haven't found if it is a known bug.

If the first note of a measure has an accidental, in one-staff music it avoids 
the preceding barline correctly.

But in piano systems this avoidance does not work, LP seems to believe that the 
music is still in a single staff because low-pitched notes (and 
high- I suppose) place more at the left, as if there were not any barline 
between staves.

Note that first e,! does not collide, but first e,! in third measure does. If 
it were an e' I wouldn't.

%begin 

upper = \relative c' {\key f \minor \time 12/8 
        r4. r8 r r r r r r r r 
        e8 e e e e e e e e e e e 
        e, e'! e! e! e! e! e! e! e! e! e! e!
        }

lower = { R1. R1. R1. }

\new PianoStaff << \new Staff \upper \new Staff \lower >>

%end

see http://www.paconet.org/lilypond-translation-es/alter-colission.pdf

-- 
Francisco Vila Doncel. Badajoz (Spain)
http://www.paconet.org