Ah, I've now realized that the \blockligatures needs to be activated as a font
feature... So forget about this point.
But, it still looks like ligature prevention with \replaceword is not working
with lmtx, but it works with --luatex.
----------------------------------------------------------------------------
% these don't prevent ligatures
\replaceword[eka][auffasse][au{ff}asse]
\replaceword[eka][auffasst][au{ff}asst]
\replaceword[eka][auffasste][au{ff}asste]
\replaceword[eka][asdf][jklö] % this works though
% block as a font feature
\blockligatures[ff]
\definefontfeature[default:nolig][default][blockligatures=yes]
% finally this here works
\startexceptions[de]
au{f-}{f}{ff}(f\zwnj f)asse
au{f-}{f}{ff}(f\zwnj f)asste
\stopexceptions
\starttext
no replacements\par
asdf
auffasste
auffasse
ff
\blank
with replacements\par
\setreplacements[eka]
asdf
auffasste
auffasse
ff
\blank
disable replacements again\par
\resetreplacements
asdf
auffasste
auffasse
ff
\blank
disable ligatures via font features\par
\definedfont[Serif*default:nolig]
asdf
auffasste
auffasse
ff
\definedfont[Serif*default] % back to normal font
\blank
now via exceptions\par
\language[de] % this should trigger ligature handling via exceptions
auffasste
auffasse
\stoptext
----------------------------------------------------------------------------
> -----Ursprüngliche Nachricht-----
> Von: ntg-context <ntg-context-boun...@ntg.nl> Im Auftrag von
> denis.ma...@ub.unibe.ch
> Gesendet: Montag, 22. März 2021 10:27
> An: j.ha...@xs4all.nl; ntg-context@ntg.nl
> Betreff: [NTG-context] Replacement mechanism?
>
> Hi,
>
> last October I've reported a strange bug with \replaceword
>
> I know there's the new mechanism for dealing with ligatures, and I still
> intend
> to convert the word list to the new format, but I'm still wondering whether
> that has been fixed.
>
> Now, I've been testing with the minimal example below, and it looks there
> might be another bug with the replacement and ligature blocking
> mechanism:
>
> ------------------------------------------------------
> % these don't prevent ligatures
> \replaceword[eka][auffasse][au{ff}asse]
> \replaceword[eka][auffasst][au{ff}asst]
> \replaceword[eka][auffasste][au{ff}asste]
> \replaceword[eka][asdf][jklö] % this works though \setreplacements[eka]
>
> % doesn't block the ff ligature
> \blockligatures[ff]
>
> % finally this here works
> \startexceptions[de]
> au{f-}{f}{ff}(f\zwnj f)asse
> au{f-}{f}{ff}(f\zwnj f)asste
> \stopexceptions
>
>
> \starttext
> asdf % replacements work in general
> auffasste
> auffasse
> ff
>
> % now via exceptions:
> \language[de]
> auffasste
> auffasse
> ff
> \stoptext
> ------------------------------------------------------
>
>
> Best
> Denis
>
> On 10/8/2020 3:15 PM, Denis Maier wrote:
> > Ok,
> > I've commented the whole nolig-german-wordlist out piece by piece, and
> > it looks like it comes down to this:
> >
> > ```
> > \replaceword[eka][auffasse][au{ff}asse]
> > \replaceword[eka][auffasst][au{ff}asst]
> >
> > \setreplacements[eka]
> >
> > \starttext
> > auffasste
> > auffasse
> > \stoptext
> > ```
> >
> > Uncommenting one of the \replacewords makes the wrong replacement
> > disappear.
> > But I don't see why "auffasste" should trigger an replacement. What is
> > happening here?
>
> i will look into it ... so patience is needed
>
> -----------------------------------------------------------------
> Hans Hagen | PRAGMA ADE
> Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
> tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
> -----------------------------------------------------------------
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