Hello Saul,
maybe if you can show us what the problem is we might be able to find some way 
to get the behaviour you want from a recent lilypond version.
Valentin

21.10.2021 04:15:59 Saul Tobin <saul.james.to...@gmail.com>:

> Got it, thanks.
> 
> This particular project is quite large and can't be updated past 2.18 due to 
> a change in the behavior of staff changing during part combining, which 
> breaks the method I use for managing wind staves. I'm not aware of a way to 
> accomplish comparable functionality in 2.19 or newer. I spent a few months a 
> couple years ago trying to write a patch but I eventually gave up.
> 
> On Tue, Oct 19, 2021, 12:15 AM Paolo Prete <paolopr...@gmail.com> wrote:
>> Hello Valentin, 
>> 
>> porting the scheme/LilyPond functions used by Spontini-Editor, in its 
>> internal library, from 2.18 to 2.19, would not complete the compatibility.
>> In fact, the editor relies on the SVG code generation too, which had changes 
>> during these years of LilyPond development. 
>> Therefore, the only way that Saul could use to accomplish what he asked, is 
>> to convert his score from 2.18 to >=2.19.84 and then feed Spontini-Editor 
>> with the converted score. 
>> 
>> 
>> Best, 
>> P
>> 
>> 
>> 
>> On Tuesday, October 19, 2021, Valentin Petzel <valen...@petzel.at> wrote:
>>> Hello Saul,
>>> 
>>> in many cases a 2.23 ly file will be compatible with a 2.18 Lilypond.
>>> 
>>> The only problematic cases should be when Spontini uses overrides that did 
>>> not exist in 2.18 (which shouldn't be that many) or if you are using music 
>>> function that have changes names or syntax, which can also be amended by 
>>> renaming the new ones to old ones or creating wrapper music functions, so 
>>> you can have a few definitions that can simply be removed for 2.18.
>>> 
>>> But is there any reason for using such an old Lilypond version?
>>> 
>>> Cheers,
>>> Valentin
>>> 
>>> 19.10.2021 01:39:59 Saul Tobin <saul.james.to...@gmail.com>:
>>> 
>>>> Any possibility of using this with a Lilypond 2.18 project?
>>>>
>>> 

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