Dutch 'trema' not handled as required in hyphenation

[R. H. van der Gaag]

Hi there fellow LyXers,
I noticed that the Dutch ‘trema’ (the dots above ü ä ï ö ë) isn’t removed when the word is hyphenated directly before the letter with the trema (it should, to comply with grammar rules. In LaTeX, 

\usepackage{newunicodechar}
\makeatletter
\newunicodechar{ë}{\@trema e}
\newunicodechar{ï}{\@trema i}
\newunicodechar{ö}{\@trema o}
\newunicodechar{ä}{\@trema a}
\newunicodechar{ü}{\@trema u}
\makeatother

takes care of this, but adding the same lines to the preamble in LyX doesn’t. Am I overlooking something? How can I make this work?

RH
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.lyx.org/pipermail/lyx-users/attachments/20230528/2b824f75/attachment.html>