Hi all,
just for the record in expectation of lily 2.10, here is a summary report
of known _NEW_ bugs in ancient notation that were newly introduced in the
2.9.x series. I list them here as a collective todo list, for myself
remembering them easier, but also for anybody else interested in the
status of ancient notation implementation. I would like to see these bugs
fixed, such that ancient notation at least does not get worse with each
new release of lilypond, but my time is currently extremely limited;
nevertheless, I will try having a look at one or another bug in the next
couple of weeks/months. Of course, any help is highly appreciated!
Mainly looking at the manual at the website (stamped as lily 2.9.21) and
also considering the "longa notes" thread (cp.
http://lists.gnu.org/archive/html/lilypond-devel/2006-10/msg00022.html),
I currently see the following bugs that were introduced in 2.9.x:
* Section 7.7.7: The "episem" articulation does not appear (there should
be a horizontal line above the three last noteheads). In 2.7.x, the
right ending was badly placed; now the episem is completely invisible.
Also, the text scripts are colliding (but that is not really an ancient
notation issue); they did not collide in 2.7.x.
* Section 7.7.9: The text scripts in the figure are unnecessarily widely
spaced; the whole thing could be placed more tightly. However, in lily
2.7.x, it was placed too tightly, such that the text scripts were
colliding. So I am not sure, if the situation now is to be seen as an
improvement or worsening. Anyway, this issue is a general script
placing issue rather than an ancient notation specific issue.
* Section 7.7.10.1, first figure: In HTML, the figure does not show at all
(in PDF, it does; probably some arithmetic problem in spacing
calculation that lets the bounding box of the figure horizontally
collapse; cp.
http://lists.gnu.org/archive/html/lilypond-devel/2006-06/msg00133.html).
Actually, I am not sure, if this problem was not already introduced in
the 2.7.x series.
* Section 7.7.10.1, second figure: Ligature brackets are not at all
displayed anymore. Same problem also in the introductionary Section
7.7.10.
* Appendix D.5.2: Horizontal padding around divisio maior (the vertical
bar-like line) is far too narrow. Note, that the horizontal spacing
looked (almost) ok, when Geoff Horton rewrote this template, cp.
http://lists.gnu.org/archive/html/lilypond-devel/2006-03/msg00174.html,
even though, at that time I already warned about possible problems...
* The "longa notes" bug (cp.
http://lists.gnu.org/archive/html/lilypond-devel/2006-10/msg00022.html)
has been tracked down to a general problem in output-lib.scm (see
http://lists.gnu.org/archive/html/lilypond-devel/2006-10/msg00050.html
for details). However, to fix it properly, note-head::calc-glyph-name
should be completely rewritten (i.e. add test for empty style value in
case statement and handle it identically as "default" style; also
replace "case" statement by completely different way of dispatch to gain
speed, e.g. with a hashtable or alist or...), which goes beyond my
scheme skills. Any help from scheme/guile gurus is appreciated!
Finally, the good news: Meanwhile, I could partially solve the
separation-item problems reported in
http://lists.gnu.org/archive/html/lilypond-devel/2006-04/msg00313.html,
so I hope to eventually correct placement of augmentum dots for
vaticana-style ligatures.
That's all for now...
Greetings,
Juergen
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