Re: Bug in 2.21.81 when afterGrace is combined with an isolated duration

[Jonas Hahnfeld]

Am Mittwoch, dem 09.12.2020 um 22:16 +0100 schrieb Mats Bengtsson:
> Hi,
> 
> I just tried a larger score in 2.21.81 and found a regression bug 
> compared to 2.20.0, that's illustrated in the following example:
> 
> \fixed c'{
> e4 8. 16 \afterGrace e2 {d16 e } | % Works fine
> f4 4 r2 |
> e4 8. 16 \afterGrace 2 {d16 e } | % Breaks in 2.21.81, works fine in 2.20.0
> f4 4 r2 |
> }

My gut feeling proved right here that this breakage is the result of an
intentional change of behavior, bisection leads to:

027538606b016afb643555d654cefaee94dfb424 is the first bad commit
commit 027538606b016afb643555d654cefaee94dfb424
Author: David Kastrup <dak@gnu.org>
Date:   Wed May 23 19:08:31 2018 +0200

    Issue 5327/4: Let \afterGrace and \scaleDurations take a scale
    
    That's more versatile than allowing just a fraction as a pair
    as previously.

 ly/music-functions-init.ly | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

So in \afterGrace 2, the argument is taken as a scale rather than music
in 2.20. I don't see a way to fix this, and I'm not sure we should
because the syntax is indeed ambiguous...

Jonas

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