Hi Marcel, thanks for your answer. On Fri, 07 Feb 2020, Marcel Fabian Krüger wrote:
The "quoteleft" is present, but you are dealing with an odd font which does not have a ASCII "grave" (U+0060). Given that the replacement is implemented as a glyph substitution it only works if the original glyph exists.
Indeed, it is not there, only U+0300 gravecomb. Strange. So does that mean that the luatex fontloader uses U+0060 instead of the quoteleft for ` ? And harfbuzz (xetex, lualatex-dev with harf) uses the quoteleft for `? Best Norbert -- PREINING Norbert http://www.preining.info Accelia Inc. + IFMGA ProGuide + TU Wien + JAIST + TeX Live + Debian Dev GPG: 0x860CDC13 fp: F7D8 A928 26E3 16A1 9FA0 ACF0 6CAC A448 860C DC13