Thanks for the heads-up on this. I haven't had a chance to look at the code
yet, but I have a good guess as to what's happening and how to fix it.
When two ledger lines are at the same vertical position, in the same note
column, (as I assume is probably the case with a pitched trill note?) we
apparently can't just assume that they overlap horizontally (as is most often
the case with chords). We will have to check whether they overlap horizontally
or not before merging them.
If this is indeed what is going on, I don't think it should be very hard to
fix. I'll try to take a crack at it when I get a chance, hopefully within a
week. So at this point I'd prefer not reverting, but fixing it with a new
patch.
---
** [issues:#4979] Pitched trill: ledger lines are connected**
**Status:** Accepted
**Created:** Fri Sep 30, 2016 08:25 PM UTC by Simon Albrecht
**Last Updated:** Sat Oct 01, 2016 07:26 AM UTC
**Owner:** Paul Morris
**Attachments:**
-
[4979.preview.png](https://sourceforge.net/p/testlilyissues/issues/4979/attachment/4979.preview.png)
(2.1 kB; image/png)
[Reported by Dimitris Marin and pre-digested by Malte
Meyn](http://lilypond.1069038.n5.nabble.com/Pitched-Trill-Collision-tp195036.html):
~~~~
:::TeX
\version "2.19.42"
\pitchedTrill a''\startTrillSpan a''
~~~~
producing the attached output.
---
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