Re: [Lilypond-auto] Issue 1772 in lilypond: Completion_rest_engraver fails with fractional rests

[lilypond]

Comment #6 on issue 1772 by address@hidden: Completion_rest_engraver  
fails with fractional rests
http://code.google.com/p/lilypond/issues/detail?id=1772

This behavior came with Pál's patch 6af4c7db to make the  
completion_heads_engraver split notes in tuplets.

 \tuplet 3/2 {b1 b b} \times 2/3 {b1 b b} \scaleDurations 2/3 {b1 b b}  
b1*2/3 b b

Pál wanted the first to split as \tuplet 3/2 {b1 b2 ~ | b2 b1} If we keep  
consistency between the four ways above that we can write this timing, then  
the last expression is split as  b1*2/3 b2*2/3 ~ | b2*2/3 b1*2/3

For the example at the top of the issue, LilyPond tries to split the r1*6/4  
into notes with a *6/4 scaling, as if was part of a tuplet.  She produces
 r2*6/4 r8*6/4 r32*6/4 r64*6/4 ~ | r4*6/4 r16*6/4 r64*6/4 r64*6/4
resulting in durations 129/128 before the bar and 33/64 after, which is  
close.

The desired output was  r1 ~ r2  (shown in test-expected.png).  We should  
use r1. to get that.

We might also want to use completion_heads_engraver to generate a  
5-measure-long tied note from b1*5, but we have issue 1532 for that.

Attachments:
        tuplet.png  3.0 KB

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