[Libreoffice-bugs] [Bug 109268] Combining Cyrillic characters overlap when placed above each other e.g. лⷣ҇

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=109268

Khaled Hosny <khaledhosny at eglug.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|---                         |NOTOURBUG

--- Comment #8 from Khaled Hosny <khaledhosny at eglug.org> ---
This is a font bug, LibreOffice does not interfere with mark positioning
provided by the font, however this font does not provide any mark positioning
at all and relies solely on heuristics applied by the text layout system.

We use HarfBuzz which have such heuristics, but it applies them only when the
font does not have GPOS table (glyph positioning table) but this font has one
that does kerning only and no mark positioning.

It is possible that the system text layout libraries that we used before
applied these heuristics more liberally. But font designers should not be
depending on such heuristics since they are neither standardized nor well
documented.

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