Strange parsing of define output-suffix "AA"

[Villum Sejersen]

lilypond 2.12.0-1 - 2.11.65-1 and most likely older versions too


The other day I tried to spare myself some post-file-renaming, (in the 
\global section in a rather simple 5-voice choral score) using:

        #(define output-suffix "SAATB_d-major")       

To my surprise the resulting filenames became: 
MyMelodyName-S_TB_d-major, not the expected MyMelodyName-SAATB_d-major.


Experiments with other usual choral double-, triple or for that matter 
quadruple-letter combinations did not show any anomalies but this one, 
that all, if three or more all but the last, occurrencies of "AA", 
"AAA", "AAAA" etc. become "_" in the output.

I am not sufficiently familiar with the source code to be able to 
pinpoint what's wrong where (i'm a choir singer, not a programmer), but 
I suspect an indexing error? ...

I ended up with the workaround: 
#(define output-suffix "SA1A2TB_d-major"), which behaved as expected. 

I don't believe Issue 714 or 404 are really related in this context.


--
yours sincerely    Villum Sejersen

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