Re: Stem tremolo and staff switch don't work together

[Jonas Hahnfeld]

Am Montag, den 05.10.2020, 10:56 -0700 schrieb Aaron Hill:
> On 2020-10-05 9:50 am, Rutger Hofman wrote:
> > Good evening bug list,
> > 
> > when a beam of notes with stem tremolo switches staff, the result is
> > decidedly buggy. See source and png. Adding \stemUp|Down doesn't make
> > things better. Without stem tremolo or without staff switch, things
> > are fine.
> 
> You can see the issue perhaps a little better with some manual tweaking 
> and a comparison without tremolo:
> 
> [...]
> 
> When the StemTremolo is present, Stem lengths are not calculated 
> properly for cross-staff notes.  The broken lower notes have the same 
> lengths as notes in equivalent positioning within the upper Staff.  It 
> would seem the Beam positions need to be adjusted when crossing the 
> Staff to account for the separation of the staves.  Otherwise, the lower 
> notes *think* the Beam is much closer than it is.

Thanks for the report and the initial investigation. I've opened an
issue at https://gitlab.com/lilypond/lilypond/-/issues/6051 so it
doesn't get lost. I can reproduce this with both 2.20 and current
master, so probably not a recent regression (if it ever worked).

Cheers
Jonas

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