Re: interesting implementation detail of \partcombine

[Keith OHara]

Mike Solomon <mike <at> mikesolomon.org> writes:

> 
> I just realized that when one uses spacer rests instead of full-measure 
rests in a voice that is being part combined, if there are full-measure rests 
in the other voice, those rests will be shifted up.Not a biggie, but perhaps 
it should be documented if it is intended behavior or fixed to work like full-
measure rests if intended behavior.  What do people think?
> 
> foo = {
>   R1 |
>   R1 |
>   a''1 |
> }
> 
> bar = {
>   s1 |
>   s1 |
>   f''1 |
> }
> 
> \new Staff \new \Voice \partcombine \foo \bar


Formerly, they were merged, but into a spacer or rest depending on 
which came first in the input file
http://sourceforge.net/p/testlilyissues/issues/261/

I argued that printing the rest to indicate its voice was the best
default choice because preserved the most information.
The 'bar' part above probably has some reason for using invisible rests, 
so we keep it separate by default;  we can \partCombineUnisono to merge.