After looking at that commit (b47350d1) and at issue [#40] it looks to me as if
one could simply revert this commit and get correct behaviour for both cases
(issue 40 and this issue), `make check` shows no other problems. But of course
there was a reason fo that commit so I’m confused …
```
--- a/lily/line-spanner.cc
+++ b/lily/line-spanner.cc
@@ -114,7 +114,7 @@ Line_spanner::calc_bound_info (SCM smob, Direction dir)
? Axis_group_interface::generic_bound_extent
(bound_grob, commonx, X_AXIS)
: robust_relative_extent (bound_grob, commonx,
X_AXIS)).linear_combination (attach);
- Grob *acc = unsmob_grob (bound_grob->get_object ("accidental-grob"));
+ Grob *acc = Note_column::accidentals (bound_grob->get_parent (X_AXIS));
if (acc && to_boolean (ly_assoc_get (ly_symbol2scm
("end-on-accidental"), details, SCM_BOOL_F)))
x_coord = robust_relative_extent (acc, commonx,
X_AXIS).linear_combination (attach);
```
Attachments:
-
[glissando_accidental_collision.png](https://sourceforge.net/p/testlilyissues/issues/_discuss/thread/61417644/0355/attachment/glissando_accidental_collision.png)
(60.3 kB; image/png)
---
** [issues:#4807] Wrong glissando slopes with accidental in target chord**
**Status:** Accepted
**Labels:** regression
**Created:** Mon Mar 21, 2016 10:59 AM UTC by Simon Albrecht
**Last Updated:** Mon Mar 21, 2016 12:17 PM UTC
**Owner:** nobody
**Attachments:**
-
[4807-2.16-no-bug.png](https://sourceforge.net/p/testlilyissues/issues/4807/attachment/4807-2.16-no-bug.png)
(4.9 kB; image/png)
-
[4807-2.18-bug.png](https://sourceforge.net/p/testlilyissues/issues/4807/attachment/4807-2.18-bug.png)
(5.4 kB; image/png)
As Harm reported, glissando slopes may be wrongly calculated, if there is an
accidental on the target chord. This worked fine in v2.16.2.
~~~~
:::TeX
\version "2.18.2"
%% up to 2.19.39
{ <d f>1\glissando <fis'' a''>1 }
%% this one is ok:
{ <d f>1\glissando <f'' a''>1 }
~~~~
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