Gravebelowcomb U+0316 won't go to the correct location

[Cormullion]

I’m trying to make the gravebelowcomb work, with no luck so far.

The _bottom anchor ought to join the bottom anchor on the other letters, I think. Even the previews are working. But I can’t find a single application where the mark is positioned correctly using the exported font:

FontGoggles:

TextExit

TextPreview

In every case, it looks like the _bottom anchor of U+0316 is matched with the top anchor of the other glyph.

What am I doing wrong?

I’m using 3.2 (3192)

[GeorgSeifert]

Can you show the anchors in the ‘U’?

[Cormullion]

There’s a top, a bottom, and a topright and an ogonek…

[GeorgSeifert]

Can you send me the file?

[GeorgSeifert]

And can you check if there is another anchor below the _button anchor?

[Cormullion]

Sure thing, I’ll send it Monday, I switched the computer off now

[Cormullion]

Hi Georg, did you manage to reproduce this?

(I was having some Apple Mail issues earlier this week; I hope it eventually made it through…)

[GeorgSeifert]

I don’t see your email. Can you send it again?

[GeorgSeifert]

You have several mark glyphs that have _bottom and _top anchors. That is not allowed (technically it is, but not with the current mark feature code. And it will produce unpredictable results – you never know if the mark will be above or below.

I added an error message for this.

[Cormullion]

Thanks for the help, Georg. I’ve fixed those other marks. But your explanation doesn’t seem to apply to this U0316 mark, which has just a single anchor, _bottom, and the U has just top and bottom anchors.

Edit: Actually, first I’m going to reboot everything and tidy up, it’s possible I’ve got cacheing problems.

[GeorgSeifert]

There is an issue with the way the mark feature is written that is triggered by the duplicate marks in the other glyphs.

[Cormullion]

Ok, thanks, Georg! I’ll see how my tidying up goes.