From 39877769ecfa442af71b4ddd1c266f401957cdd8 Mon Sep 17 00:00:00 2001
From: Norbert Preining <norbert@preining.info>
Date: Sat, 1 Jan 2022 03:00:53 +0000
Subject: CTAN sync 202201010300

---
 systems/doc/luatex/luatex-modifications.tex | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

(limited to 'systems/doc/luatex/luatex-modifications.tex')

diff --git a/systems/doc/luatex/luatex-modifications.tex b/systems/doc/luatex/luatex-modifications.tex
index bf4233165b..caf643913f 100644
--- a/systems/doc/luatex/luatex-modifications.tex
+++ b/systems/doc/luatex/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}}]
-- 
cgit v1.2.3

