Misplaced combining acute accent U+0301 on Cyrillic letters

eg9 commented 8 years ago

The combining acute accent U+0301 is misplaced on Cyrillic uppercase vowels and on wide lowercase ones.

The bug is also on legacy Linux Libertine fonts.

Example file

\documentclass{article}

\usepackage{fontspec}
\setmainfont{Libertinus Serif}
\setsansfont{Libertinus Sans}

\newcommand\CyrillicAccents{А а А́ а́ \\ Е е Е́ е́ \\ И и И́ и́ \\ О о О́ о́ \\
  У у У́ у́ \\ Ы ы Ы́ ы́ \\ Э э Э́ э́ \\ Ю ю Ю́ ю́ \\ Я я Я́ я́}

\begin{document}

\parbox[t]{3cm}{\CyrillicAccents}
\parbox[t]{3cm}{\sffamily\CyrillicAccents}

\end{document}

Reference: http://tex.stackexchange.com/questions/199080/misplaced-accents-in-cyrillic-text

Output

screen shot 2016-02-01 at 14 01 10

khaledhosny commented 8 years ago

Looks like almost all Cyrillic glyphs lack anchors for accent positioning, it can be fixed but it is a laborious task so will take a while (let me know if you want to help and can get FontForge running on your system, I’ve some ideas that would allow something familiar with Cyrillic to help without needing much experience with font development).

KrasnayaPloshchad commented 7 years ago

This bug also affect letter С́, which is recommended for Montenegrin.

landswellsong commented 6 years ago

@KrasnayaPloshchad does it affect З́?

KrasnayaPloshchad commented 6 years ago

Yes.

khaledhosny commented 5 years ago

These fonts were not designed to handle combining marks, fixing this will require an overhaul of how combining marks handled. No need to open issues for individual problems.

alerque / libertinus

Misplaced combining acute accent U+0301 on Cyrillic letters #17