Am 08.03.24 um 18:50 schrieb Pablo Rodriguez via ntg-context:
Dear list,
the following latest gets differents results when compiled with MkXL and MkIV (in current latest from 2024.03.05 11:26):
\definefontfamily[mainface][rm][TeX Gyre Termes] [features={default, quality}, it={style: regular, features:{default, quality, slanted}}, sl={style: regular, features:{default, quality, slanted}}]
\setupbodyfontenvironment [default] [em=italic]
\setupbodyfont[mainface] \starttext \startTEXpage[offset=1em] a\\ \em b\\ \em c\\ \em d\\ \stopTEXpage \stoptext
LMTX gets b, c and d in slanted form.
LuaTeX gets only b and c in slanted form.
With latest LMTX (2024.03.05), b and d are slanted, as I would expect. This might be just a test case, but I’d avoid switches like \em without grouping. Hraban