[latex3-commits] [latex3/latex2e] protected-tilde: Add a code comment (c8dcd451)

[github at latex-project.org]

Repository : https://github.com/latex3/latex2e
On branch  : protected-tilde
Link       : https://github.com/latex3/latex2e/commit/c8dcd451f4d84264ade95c7cdfd8a7a8a433c552

>---------------------------------------------------------------

commit c8dcd451f4d84264ade95c7cdfd8a7a8a433c552
Author: Joseph Wright <joseph.wright at morningstar2.co.uk>
Date:   Thu Oct 26 17:52:21 2023 +0100

    Add a code comment


>---------------------------------------------------------------

c8dcd451f4d84264ade95c7cdfd8a7a8a433c552
 base/ltspace.dtx | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/base/ltspace.dtx b/base/ltspace.dtx
index 0c08ab52..59b7744b 100644
--- a/base/ltspace.dtx
+++ b/base/ltspace.dtx
@@ -1214,13 +1214,17 @@
 %   We need to keep \cs{@xobeysp} as it is widely used; so here it is
 %   let to the non-robust command \cs{nobreakspace }.
 %
+%   The fragile version of |~| needs a brace group after \cs{nobreakspace}
+%   to prevent loss of spaces if it occurs in an expansion context. That's
+%   not an issue with the updated \cs{protected} definition, so we keep the
+%   code shorter and avoid that.
 %    \begin{macrocode}
 \DeclareRobustCommand{\nobreakspace}{%
    \leavevmode\nobreak\ }
 \catcode `\~=13
 %</2ekernel>
 %<latexrelease>\IncludeInRelease{2023/11/01}%
-%<latexrelease>                 {[tilde]}{Protected tilde}%
+%<latexrelease>                 {\tilde}{Protected tilde}%
 %<*2ekernel|latexrelease>
 \protected\edef~{%
   \noexpand\ifincsname\noexpand\expandafter\string~%