Wrong placement of combining diacritic marks

[Vuizur]

When I for example place a combining acute accent mark over a cyrillic symbol, it should look like this: прода́жу.

With Roboto flex, it unfortunately places the symbol incorrectly over the character one to the right of the correct character.

Other google fonts do not have this problem and place it correctly:

Thanks for the help!

[dberlow]

Thanks for your comment,
My input works fine:

What’s your input?

[Vuizur]

It is the same what you have written (copy-pasted прода́жу from my first comment).

I can reproduce the problem on two Windows PCs (one Windows 10 and one Windows 11). I just checked it also on my android tablet, and there I have the same problem. I'm surprised iOs gets it right, it might render fonts differently 🤔.

[dberlow]

I copy and pasted your input and got no accent above the /a. My input was á (option-e, a) in the mac. Also, because of the vast differences between OS, the speed at which they progress in type tech, and the issues involved with a 15 axes variable font begun 4 years ago, the target environment for testing when it was finished was just Chrome. So, please post the versions of Windows and Android. Thanks.

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On Tue, Aug 8, 2023 at 12:36 PM Hannes Krumbiegel ***@***.***> wrote: It is the same what you have written (copy-pasted прода́жу from my first comment). I can reproduce the problem on two Windows PCs (one Windows 10 and one Windows 11). I just checked it also on my android tablet, and there I have the same problem. I'm surprised iOs gets it right, it might render fonts differently 🤔. — Reply to this email directly, view it on GitHub <#385 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAO5VDRAEWSFUMQZW7V6OQ3XUJTKDANCNFSM6AAAAAA3IJJVHI> . You are receiving this because you commented.Message ID: ***@***.***>

[Vuizur]

Thanks for the reply.

My input was á (option-e, a) in the mac.

I think this is LATIN SMALL LETTER A WITH ACUTE, this one should be displayed everywhere well. In the original word I had CYRILLIC SMALL LETTER A + COMBINING ACUTE ACCENT. (There are other combinations where there is no latin alternative and the acute accent can not in theory be replaced, like Маши́на). I used this tool: https://apps.timwhitlock.info/unicode/inspect

My current Windows is Windows 11 22H2. I have a Samsung Tablet with Android 12. On both systems both Chrome and Firefox are affected.

[kenmcd]

Cyrillic small letter a (U+0430) does not have a top anchor in Roboto Flex v3.200.
So the acutecomb has nowhere to attach.

On my Windows 10, your text above (прода́жу) is displayed with Segoe UI - and that font does have a top anchor on Cyrillic small letter a (U+0430) so it looks OK.

[dberlow]

Thanks, I see (прода́жу) it not working in Chrome in another font.
It's simple enough to script a copy of marks from e.g. /a to a component of itself in each source.
Is that á the only combination though?

@m4rc1e can tell us how to proceed?

[VladWinner]

Is that á the only combination though?

An acute accent can be applied to almost all Cyrillic vowels (ё is excluded because it is a stressed syllable by default).
а → а́
у → у́
о → о́
е → е́
и → и́
я → я́
ю → ю́
э → э́
ы → ы́

Example: сала́т, ку́ртка, коро́ва, пе́сня, ли́ния, семья́, ю́бка, э́ра, ры́ба