You've encountered an earlier engraving convention for how to show pitches
that continue from a previous measure. If you look at more autograph and
earlier published scores from the 17th and 18th centuries you'll find this.
It is, essentially, what we today call a "tied" note. I'm sure you know how
that looks. While you can attempt to discover a way to typeset this in
Lilypond, perhaps the better course is to use modern convention unless you
actually intend to use older conventions. But then, you'll likely need to
include an Explanations page for people to explain this unfamiliar
notation. I did a quick review of imslp.org and sure enough the first score
listed for BWV1004 shows this dot-as-tie (the Bach-Gesellschaft Ausgabe,
Band 27 Breitkoph and Haertel from 1879) while the Neue Bach-Ausbgabe from
1958 shows the tied note.

Guy Stalnaker

On Wed, Mar 7, 2018 at 6:39 PM, Edmundo Carmona Antoranz <
eantor...@gmail.com> wrote:

> Hi!
> You know the chaconne from BWV 1004, right? On the bar before last,
> there's an apparent dot written at the position of the f at the
> opening of the bar. I didn't know if it was a staccato mark or other
> kind of expressive mark for the violin or a mistake but I also found
> it on Anna Magdalena' Bach's manuscrit, not just Bach's. So I asked
> around[1] and apparently it's a "harmonic delay" or a prolongation...
> it's the first time ever I see something like that written on a part
> (though I know the concept of the harmonic delay from the few classes
> of harmony I did "back in the day"). So.... I looked around how to
> write it on lilypond but i found nothing. What do you think is the
> best way to achieve it?
> Thanks in advance.
> [1] https://music.stackexchange.com/questions/67493/bwv-1004-
> is-there-a-pause-by-the-end-of-ciaccona-or-is-it-staccato
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