Recent betas have introduced a bidi-related problem with register
processing.
In the following example, compilation generates a recoverable error when
register processing has to trim an entry to fit maxwidth. The error is:
luatex warning > node filter: error:
...eXt/tex/texmf-context/tex/context/base/mkiv/typo-dub.lua:496: attempt to index
local 'stacktop' (a nil value)
Removing the maxwidth constraint, or setting it to a much wider value,
allows error-free compilation.
Without \setupdirections[bidi=on,method=two] there is no problem, but
without it RTL texts are not handled properly. This is a recent change;
bidi=global worked a few months ago. (I have not tried with LTR text in
a default-RTL document).
% macros=mkvi
\defineregister[Mindex]
\setupregister [Mindex]
[n=2,
maxwidth=4cm,
balance=no]
\starttexdefinition unexpanded MIndex
\dosinglegroupempty\doMIndex
\stoptexdefinition
\starttexdefinition unexpanded doMIndex #MARKER
\def\Marker{#MARKER}%
\dosinglegroupempty\doMIndexFull
\stoptexdefinition
\starttexdefinition doMIndexFull #ITEM
\doifelse{#ITEM}{}
{\expanded{\Mindex{\Marker}}}
{\expanded{\Mindex{\Marker+#ITEM}}}
\stoptexdefinition
\setupdirections [bidi=on,method=two]
\setupbodyfont [libertinus,11pt]
\starttext
\startparagraph
\MIndex{One}{Mairzy doats and dozy doats and liddle lamzy divey}
\input jojomayer
\stopparagraph
\startparagraph
סלאם שלום
\stopparagraph
\placeregister[Mindex]
\stoptext
--
Rik Kabel
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