Letters i and j with diacritics, and Soft_Dotted property

[codepointless]

Latin letters i and j should lose their dot when used with any combining marks above. It is pointed out in the Unicode standard (see section ‘Diacritics on i and j’ on page 289 and figure 7-2), and popular fonts follow this practice:

With Source Serif Pro, I get this instead:

Actually, the same rule also applies to Latin characters
į ị ⁱ ʲ
and Cyrillic letters
і ј,
since they all have the Soft_Dotted property in Unicode (see PropList.txt; here I list only characters included in Source Serif). Unfortunately, existing fonts support this property very inconsistently, and Noto seems to be the only font that really tries to do it right.

[frankrolf]

Which environment do you observe this behavior in?

[codepointless]

I tried MS Word, and also made HTML and opened it in Firefox. In both cases diacritical marks are rendered correctly only if a precomposed character exists in the font. So, j with combining circumflex looks like ĵ, but j with combining acute looks like... well, see the picture above.

Oh, I also tried web-fonts here. Same result anyway.

[frankrolf]

This is a good time to bring this up – thank you for that.
I will have a look at the feature code, and hopefully fix the problem.

[frankrolf]

I fixed the issue for i j і ј (Latin and Cyrillic), as well as į ị.
There currently is no method in place for combining accents on top of superiors, so I left out ⁱ ʲ.

[frankrolf]

This is resolved in Source Serif 4.004: https://github.com/adobe-fonts/source-serif/releases/tag/4.004R