On Fri, 14 Mar 2025 at 23:34, Ulrike Fischer <news3@nililand.de> wrote:
With the newest binaries from today (Development id: 7671) I no
longer get an italic kern after a f in math with legacy fonts:

\tracingoutput1
\showboxbreadth\maxdimen
\showboxdepth\maxdimen
$f(x)$
\bye


...\hbox(0.0+0.0)x20.0, direction TLT
...\mathon
...\teni f
...\tenrm (
...\teni x
...\tenrm )
...\mathoff


with pdftex or luatex from texlive 2024

...\teni f
...\kern1.0764 (italic)
...\tenrm (
...\teni x
...\tenrm )

With open type fonts / unicode-math there is no problem.

Ulrike


just pushed 
 commit 7a68c07c29cafe9579c24e0b97ebe78de2962caf (HEAD -> master, origin/master, origin/HEAD)
Author: Luigi Scarso <luigi.scarso@gmail.com>
Date:   Sat Mar 15 21:49:15 2025 +0100

    italicsmode fix for eight bit fonts (H.Hagen)

can you check it ?

--
luigi