Piano Pedal alignment

[Rune Zedeler]

IIRC when the bracket style was introduces, sequential pedal requests 
also were vertically aligned.
As you can see this no longer is the case :-(

\score {
    \notes {
        \property Staff.SustainPedal \override #'pedal-type = #'mixed
        c'1 \sustainDown c' \sustainUp c \sustainDown c \sustainUp
    }
    \paper {}
}