Re: [Lilypond-auto] Issue 4127 in lilypond: Patch: Let \time in mid-measure work without warning in some cases

[lilypond]

Comment #20 on issue 4127 by address@hidden: Patch: Let \time in mid-measure  
work without warning in some cases
https://code.google.com/p/lilypond/issues/detail?id=4127

Strike my first impulse in comment #19: I was thinking of ossia staves  
particularly but they would need extra work on a perfect staff boundary too.

When using an extra context for maintaining timing data, it might be  
inconcenient to have to enter \partial into it whenever a voice may come in.

So I'd lean towards only warning for explicit time signatures which are  
identifiable when the upcoming TimeSignatureEvent is available.  The  
disadvantage would be that you'd get no warnings at all for the timing  
coming from an extra track without its own time signature engraver, having  
to revert to barchecks instead.

This seems like a tolerable tradeoff.  Whether the total effort for the  
warning is exaggerated is a different question, but when warning only about  
explicit time signatures one catches the cases where

a) the warning location is accurate
b) we are not likely talking about an artifact
c) the fix is obvious (\partial in the proper place) and may be necessary  
for more than just fixing the warning (like getting beaming patterns match  
the purported measure position depending on the placement of \partial)

We don't want to force the user to develop strategies for suppressing  
warnings.  Warnings are supposed to be useful rather than a puzzle game.

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