\ictus spacing in Gregorian chant contexts

[Tim Fitzgerald]

> I'm not top posting.

% The \ictus has incorrect horizontal spacing, it should be centered under (or
over, in some cases) the nuem.  It is too far to the left.
% Regards Tim.  See code below.


\version "2.10.19"
\paper{ ragged-right=##t }

\include "gregorian-init.ly"

\score { <<
\context VaticanaVoice = "cantus" {
\override Script #'padding = #-0.1
\clef "vaticana-do3"

        \[ f\melisma f \pes g\melismaEnd \]
        f
        \[ f\ictus \]
        \[ f \pes g\ictus \pes a\
        
        \[ s8 \]
        

} %//end of cantus


\lyricsto "cantus" \new Lyrics {
Re- qui- em %aet\'{e}r- nam
} %// end of lyrics

>> } %//end of score