Adapt l3doc for ltcmd change to handling of newlines

See latex3/latex2e#1304.
latex3 · Mar 28, 2024 · bb30f67 · bb30f67
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diff --git a/l3kernel/CHANGELOG.md b/l3kernel/CHANGELOG.md
@@ -9,6 +9,8 @@ this project uses date-based 'snapshot' version identifiers.
 
 ### Changed
 - Expand object names in `\pdf_object_...` functions (issue \#1521)
+- Adapt `l3doc` for `ltcmd` change to handling of newlines
+  (see latex3/latex2e\#1304)
 
 ### Fixed
 - Global assignment to constant in `\cctab_const:Nn` (issue \#1508)

diff --git a/l3kernel/l3doc.dtx b/l3kernel/l3doc.dtx
@@ -2181,6 +2181,8 @@ and all files in that bundle must be distributed together.
       {
         \tl_remove_all:Ne \l_@@_tmpa_tl
           { \iow_char:N \^^M \c_percent_str }
+        \tl_remove_all:Ne \l_@@_tmpa_tl
+          { \token_to_str:N \obeyedline \c_space_tl \c_percent_str }
         \tl_remove_all:Ne \l_@@_tmpa_tl { \tl_to_str:n { ^ ^ A } }
         \tl_remove_all:Ne \l_@@_tmpa_tl { \iow_char:N \^^I }
         \tl_remove_all:Ne \l_@@_tmpa_tl { \iow_char:N \^^M }