Re: no natural sign when clef changes

[David Kastrup]

Keith OHara <address@hidden> writes:

> Bernhard Ott <bernhard.ott <at> gmx.net> writes:
>> 
>> IMHO there should be a natural sign showing the f' after the 
>> clef-change: am I wrong?
>> 
>> music = \relative c' {
>>      c8 d e fis
>>      c d e f
>>      c8 d e fis
>>      \clef "alto" c d e f
>> }
>
> This is a bug, listed at
> http://code.google.com/p/lilypond/issues/detail?id=1471
>
> The desired behavior would be to print accidentals if they either
> 1) differ from the previous accidental if it is "still in force" under
> the chosen accidental style, OR
> 2) are the first after the clef change to differ from the key signature.
>
> At the clef change, LilyPond currently resets the "still in force" list back
> to the key signature.  This succeeds in repeating accidentals of case-2 such
> as \clef "alto"  c d e fis , but it causes the worse problem of losing
> accidentals of case-1 when these bring us back to the key signature.
>
> I suspect the first step to a solution is simply to have LilyPond
> leave the "still in force" list un-touched at a clef changes, so that
> the required accidentals of case 1 are printed.  What I don't see,
> however, is a simple way to get the courtesy accidentals printed for
> case 2.

I think the solution would be to replace the presumably existing list of
"currently altered accidentals" not by an empty list but rather by a
list where every such accidental is replaced with a non-existing "dirty"
accidental.

-- 
David Kastrup