> Nice, thanks! In case this works in general, would it make sense to > add that to `\breakDynamicSpan`?
Don’t think that’s a good idea. `\breakDynamicSpan` is intended to break the
current dynamic line at this time step, not to break to dynamic events at the
same time.
The intended purpose for this is a setting like this
```
{
\dynamicUp
g''1\fermata\f\>\breakDynamicSpan
\section
c''4\p\< 4 4 4 |
2\sf
}
```
where a dynamic marking is not linked to the previous hairpin. Applying Harms
code here does cause issues in this intended scenario:
```
{
\dynamicUp
g''1\fermata\f
-\tweak before-line-breaking
#(lambda (grob)
(let ((dyn-txt (ly:spanner-bound grob LEFT)))
(ly:spanner-set-bound! grob LEFT (ly:grob-parent dyn-txt X))))
\>
\breakDynamicSpan
\section
c''4\p\< 4 4 4 |
2\sf
}
```
So what you are intending to do is not at all something `\breakDynamicSpan` is
designed for. In fact your problem is not actually the `DynamicLineSpanner`,
as dynamics with different direction will break the `DynamicLineSpanner`
anyway.
As Harms has shown it is actually the fact that in dynamic-engraver.cc:175 the
left bound of the hairpin is set to any dynamic script that might exists, even
if it is not in the same direction as the hairpin. In theory this should be
fixable by adding a check for direction of hairpin matching direction of the
script event.
Modifying Harms solution we can also do:
```
\layout {
\context {
\Score
\override Hairpin.before-line-breaking =
#(lambda (grob)
(let* ((bound-left (ly:spanner-bound grob LEFT))
(bound-right (ly:spanner-bound grob RIGHT))
(line-span (ly:grob-parent grob Y))
(bound-left-line-span (ly:grob-parent bound-left Y))
(bound-right-line-span (ly:grob-parent bound-right Y)))
(if (not (eq? line-span bound-left-line-span))
(ly:spanner-set-bound! grob LEFT (ly:grob-parent bound-left X)))
(if (not (eq? line-span bound-right-line-span))
(ly:spanner-set-bound! grob RIGHT (ly:grob-parent bound-right
X)))))
}
}
{
c''2_\ppppp^\> 2\!
2^\> 2_\ppppp
2^\< 2\>\breakDynamicSpan
2^\ppppp^\< 2\!
}
```
This will apply Harms logic for left and right bound only if it belongs to a
different dynamic line span group.
Cheers,
Tina
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