Double punctum mora (..) in justified lines

[davidweichiang]

g.. shows up like this:

[davidweichiang]

Noted in #1654

[fiat96]

That's how it appears in the documentation, perhaps intentional? I have no idea when one would want two mora on one note, anyway.

[davidweichiang]

Yes, my image was also just copied from the documentation :)

But on the website, it looks like this:

[rpspringuel]

The double mora is supposed to place one directly above the other. I don't think the common usage is to put two mora on a single note, but rather for a nicer look when you've got two descending notes both with the mora (e.g. hg..). Look at rem in https://gregobase.selapa.net/chant.php?id=2060 (3rd line). If you place the mora on the notes individually, then the on on the higher note is hard to see because it ends up over the second note (though that is sometimes desired, as in https://gregobase.selapa.net/chant.php?id=18870).

The fact that you can place two mora on a single note comes from the fact that the it's difficult to either look ahead for a double mora on the next note or to go back and modify a previous note when a double mora is encountered.

[davidweichiang]

Also, don't the single dots look too far away from their notes?

[rpspringuel]

They do. Not sure why that is. spacebeforesigns should be the same in both cases.

[davidweichiang]

I think it's because spacebeforesigns has some glue, and the line is justified. In the case of the double punctum mora, one of the dots presumably doesn't have the glue?

[rpspringuel]

Hmm... The dots are not printed simultaneously (i.e. they are separate glyphs), so we have to "back-up" after printing the first before printing the second to get them vertically stacked. With glue involved, perhaps the stretching/shrinking is affecting the amount of back-up that is needed?

What's supposed to be happening is:

1. print note
2. insert spacebeforesigns (and other shifts that happen between notes and punctum mora based on circumstances)
3. print first punctum mora
4. back-up the width of a punctum mora
5. print second punctum mora

Maybe we need to stack the two punctum mora in a box in order to assure their vertical alignment?

[davidweichiang]

That makes sense. But I’m also puzzled why this space has glue. The problem would also be solved by removing the glue…

[rpspringuel]

To be honest, I don't know why it does either. That's something that's been around since before I got started and all I've ever done is preserve it.

[eschwab]

It probably should not have glue. Even with justified line I would expect all signs to be consistently placed in relation to the note.