Re: Add Modal transformations (issue4126042)

[Keith OHara]

On Thu, 03 Feb 2011 17:43:38 -0800, <address@hidden> wrote:
> not a patch comment, but I'm intrigued -- how often do you think that
> people use automatic ties?

I had never used them or seen them used.
But the moment I started playing with \retrograde, on a melody that did not 
fill an integral number of measures, I wanted automatic ties.

>  And why does this code work with the
> Completion_heads_engraver but not manual ties?
Only the starting points of ties are stored in the internal representation, as 
seen with \displayMusic.  After the music is reversed, the tie event is 
attached to the second note rather than the first, so it breaks.  This is in 
contrast to slurs which have a begin and an end event, thoughtfully reversed by 
the code implementing \retrograde.

If we choose to depend on automatic ties, we can simply write long note-values, 
which have no problem with being reversed, and let the engraver set the ties on 
the result.

-Keith