Re: Issue 3918: Add \alternatingTimeSignatures (issue 97110045)

[Paul Morris]

David Kastrup wrote
> There is not one "code that handles overriding stencils".  Overrides are
> a general mechanism.  So we are talking about the code _interpreting_
> stencils.  This code will tend to be some get_property ("stencil") call.
> There are a lot of those from a lot of different engravers.
> 
> Making this consistently workable would require tampering with a lot of
> call sites.

Ah, ok, I get it now. Thanks for the explanation.  (So if someone tries to
override a stencil with a markup, the markup is actually set as the grob's
stencil property at that point, and it's not until an engraver tries to
interpret it that an error is given, because a stencil is expected and not a
markup.)


David Kastrup wrote
>> You know the code and I trust your judgement.  I'm just curious.  In
>> any case, a command like \appearance would get the job done and be
>> simpler for the user.  I suppose it could accept either a markup or a
>> stencil and just pass the stencil through to the override (or tweak)
>> if a stencil was supplied.
> 
> A user-level command could indeed accept either markup or stencil and
> create a suitable override depending on which it gets.  There is,
> however, also the possibility to write \markup \stencil #... in order to
> let a markup pass through a stencil.  It's just more verbose and more
> back-and-forth.

Good point. I still like accepting either markup or stencil since it's
simpler for the user, but either way would work.

Cheers,
-Paul



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