Battle of the beginning of a measure: Rehearsal marks vs. Manual volta brackets

[Romel Anthony Bismonte]

Hi all,
 
I have no knowledge as to how LilyPond does the spacing for this specific situation, but I seem to have a war going on between the rehearsal mark (marking the second line as a Coda) and the Volta bracket.
 
% --- original file --- %
\version "2.10.25"
#(define-markup-command (jumptext layout props txt)
    (string?)
    (interpret-markup layout props
        (markup #:small #:italic txt)
    )
)
codatext = \markup \line {
    \smaller \musicglyph #"scripts.coda"
    \jumptext #"Coda"
}
dsalcoda = \markup \line {
    \dalsegno
    \jumptext #"al Coda"
    \translate #(cons 1 1)
    \small \musicglyph #"scripts.coda"
}

\paper {
    ragged-right = ##t
}
\score {
    \new Voice = "test" \relative c' {
        e2 r4
        c16 d e 
        g^\markup \dsalcoda
        \break
        \bar "||"
        \mark \markup \line { 
            \hspace #0 
            \translate #(cons -12 4) 
            \codatext
        }
        \set Score.repeatCommands = #'(start-repeat (volta "1.-3."))
        a,2 ~ a8 d16 e d c a g
        \set Score.repeatCommands = #'((volta #f) end-repeat (volta "4."))
        a1 ~ 
        \set Score.repeatCommands = #'((volta #f))
        a1\fermata
        \bar "|."
    }
}

The three definitions before the score block (jumptext, codatext, and dsalcoda) are in a file called "oldschooljumps.ly" which in my actual project is \included in. I just put them inline here so that the whole thing would compile as one file.
 
As you can see, the volta bracket begins "after" the low half-note A, when in fact it should begin right before that. What I think is happening is that the Rehearsal Mark containing the Coda has its own space, and is pushing the volta bracket a bit to the right. How do I make the volta stretch to the beginning of the measure? Would it work if I were to remove the Coda from space calculations by \overriding the TextScript's #'extra-offset?
 
Thank you very much in advance.
 
Romel
 
P.S. When is Version 2.12 coming out?

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