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-rw-r--r--Master/texmf-dist/doc/luatex/base/luatex-modifications.tex18
1 files changed, 17 insertions, 1 deletions
diff --git a/Master/texmf-dist/doc/luatex/base/luatex-modifications.tex b/Master/texmf-dist/doc/luatex/base/luatex-modifications.tex
index bf4233165b9..caf643913f4 100644
--- a/Master/texmf-dist/doc/luatex/base/luatex-modifications.tex
+++ b/Master/texmf-dist/doc/luatex/base/luatex-modifications.tex
@@ -1,4 +1,4 @@
-% language=uk
+% language=us engine=luatex runpath=texruns:manuals/luatex
\environment luatex-style
@@ -507,6 +507,14 @@ opened it up.
\stopsubsection
+\startsubsection[title=Changes from anywhere]
+
+The \type {\partokenname} and \type {\partokencontext} primitives are taken from
+the \PDFTEX\ change file posted on the implementers list. They are explained in
+the \PDFTEX\ manual and are classified as \ETEX\ extensions.
+
+\stopsubsection
+
\startsubsection[title=Changes from standard \WEBC]
\topicindex {\WEBC}
@@ -1129,6 +1137,14 @@ kerns, should be handled in the input or macro package because there is no way w
can predict the expected behaviour. In fact, the \lpr {linedir} is just a
convenience extra which could also have been implemented using node list parsing.
+Directions are complicated by the fact that they often need to work over groups
+so a separate grouping related stack is used. A side effect is that there can be
+paragraphs with only a local par node followed by direction synchronization
+nodes. Paragraphs like that are seen as empty paragraphs and therefore ignored.
+Because \type {\noindent} doesn't inject anything but a \type {\indent} injects
+an box, paragraphs with only an indent and directions are handles as paragraphs
+with content.
+
\stopsubsection
\startsubsection[title={Controlling glue with \lpr {breakafterdirmode}}]