Interestingly the problem happens only for quaters not for other durations.
And if I extend the quater's X-extent to that of a half note with
\override NoteHead.X-extent = #'(-0.0 . 1.377346)
(applied to Malte's code) the clash vanish.
Ofcourse this is not a workaround (the value would need adjustment for changed
staff-sizes, the stem-attachment is off and likely other problems), but may
point to the direction where to look for the cause of the clash.
---
And yes, first bad commit is:
commit 87eb2f9fe1be3a532675fe4b7322bbba5a60ba5c (HEAD)
Author: Carl Sorensen <[email protected]>
Date: Sat Mar 5 21:30:46 2016 -0700
Use a negative value of overdone_noteheads to shrink the head slightly
Changing recent master to the former value:
$ git diff
diff --git a/mf/feta-params.mf b/mf/feta-params.mf
index 36549e85ed..bb3dc2867f 100644
--- a/mf/feta-params.mf
+++ b/mf/feta-params.mf
@@ -250,7 +250,7 @@ slash_thick# := 2/3 * 0.48 staff_space#;
% reduce the notehead height. Empirically, we have determined that
% reducing by 10% of stafflinethickness solves the problem.
-overdone_heads = -0.1;
+overdone_heads = 0.0;
noteheight# := staff_space# + (1 + overdone_heads) * stafflinethickness#;
define_pixels (slash_thick);
returns not clashing output.
Ofcourse the (here reverted) patch was meant to fix a problem, which now will
arise again...
---
** [issues:#5540] clash between staves**
**Status:** New
**Created:** Mon Jul 22, 2019 01:00 PM UTC by Werner LEMBERG
**Last Updated:** Wed Jul 24, 2019 04:05 AM UTC
**Owner:** nobody
**Attachments:**
-
[staff-clash.png](https://sourceforge.net/p/testlilyissues/issues/5540/attachment/staff-clash.png)
(6.0 kB; image/png)
[lilypond git 49f41bf1c64ae1e2490571e73a85cbc4b2a9fb27]
The example below exhibits a clash between staves. It's easy to circumvent,
but it definitely shouldn't happen, since it gets triggered by non-musical
parameters. Maybe a rounding issue?
~~~~
% Sizes 17 and 18 also cause a clash.
#(set-global-staff-size 16)
\paper {
% Commenting out this line removes the clash;
% values like 5cm and larger also remove the clash.
indent = 4\cm
}
% The notes below trigger the clash;
% I wasn't successful in simplifying it more.
<<
\relative c' {
d2 d4 d |
d8.[ d16] << { d4 } \\ { <a c> } >>
}
\relative c' {
e2 e4 e |
e4 <d b'>
}
>>
~~~~
---
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