Override of fingering font is ignored by \finger

[Nick Payne]

See attached. Overriding the fingering font works fine for fingering 
attached to a note but is ignored when using \finger in a markup, where 
the default fingering font is still used.

\version "2.15.37"

\relative c'' {
    \override Staff.Fingering #'font-name = #'"Arial Black"
<e-4>4 cis d\prall^\markup { \concat { \finger 4 \hspace #0.15 \tiny { / 
} \finger 2 } }
}

test.png
Description: PNG image