[Lilypond-auto] Issue 3615 in lilypond: always print key signature grobs, even for keys with no sharps or flats

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Enhancement

New issue 3615 by address@hidden: always print key signature grobs,  
even for keys with no sharps or flats
http://code.google.com/p/lilypond/issues/detail?id=3615

Paul Morris wrote :

Say you want to override all key signature grobs, either to use a  
non-standard key signature system, or to enhance the traditional key  
signature system, as in this snippet:
http://lsr.dsi.unimi.it/LSR/Item?id=856

...unfortunately, for keys with no sharps or flats like C major and A  
minor, LilyPond does not always give you a key signature grob to override.

For these keys LilyPond *does* put an empty (invisible) key signature grob  
at the beginning of the first line of music, and also any time the key  
changes to a key with no sharps or flats.  However, LilyPond does *not*  
include an empty key signature grob at the beginning of any lines of music  
after the first.

The attached files illustrate this.  On the lower staff a simple custom key  
signature engraver replaces all key signature grobs with a solid circle.   
(Just for demonstration, not an actual use case, obviously.)  Note how  
there is no black circle at the beginning of the 2nd and 4th lines of music  
(i.e. at measures 13 and 39).

Of course, this is not a problem for standard use, so this is an  
enhancement request rather than a bug, and no doubt a very low priority one  
at that.  However, to better support overriding key signatures, I think it  
would be an improvement if LilyPond were more consistent and always  
provided a key signature grob to override, regardless of the key.

(This did come up on the user list in relation to the snippet linked above:
http://lists.gnu.org/archive/html/lilypond-user/2012-11/msg00545.html )

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