bug#52102: 29.0.50; Build failure in doc/lispref/display.texi

[Robert Pluim <rpluim@gmail.com>]

>>>>> On Thu, 25 Nov 2021 09:25:28 -0300 (CLST), Horst von Brand <vonbrand@inf.utfsm.cl> said:

    Horst> Build "make distclean; ./autogen.sh; make install" fails:

    Horst> /home/vonbrand/tmp/emacs/doc/lispref/display.texi:2055: @group invalid in conte
    Horst> xt where filling is enabled.
    Horst> @group ...lid in context where filling is enabled}
    Horst>                                                   @fi @startsavinginserts @s...
    Horst> l.2055 @group
             
    Horst> ? 
    Horst> /home/vonbrand/tmp/emacs/doc/lispref/display.texi:2055: Emergency stop.
    Horst> @group ...lid in context where filling is enabled}
    Horst>                                                   @fi @startsavinginserts @s...
    Horst> l.2055 @group
             
    Horst> Output written on elisp.dvi (1096 pages, 4170096 bytes).
    Horst> Transcript written on elisp.log.
    Horst> /usr/bin/texi2dvi: etex exited with bad status, quitting.
    Horst> make[1]: *** [Makefile:150: elisp.dvi] Error 1
    Horst> make[1]: Leaving directory '/home/vonbrand/tmp/emacs/doc/lispref'
    Horst> make: *** [Makefile:1084: install-lispref-dvi] Error 2

Does this fix it? Eli, emacs-28 has the same issue.

diff --git a/doc/lispref/display.texi b/doc/lispref/display.texi
index 6742f0ea2d..0bdbc06013 100644
--- a/doc/lispref/display.texi
+++ b/doc/lispref/display.texi
@@ -2052,14 +2052,14 @@ Size of Displayed Text
 property (@pxref{Display Property}) showing the ellipsis, instead of
 actually truncating the string.
 
-@group
 @example
+@group
 (truncate-string-to-width "\tab\t" 12 4)
      @result{} "ab"
 (truncate-string-to-width "\tab\t" 12 4 ?\s)
      @result{} "    ab  "
-@end example
 @end group
+@end example
 
 This function uses @code{string-width} and @code{char-width} to find
 the suitable truncation point when @var{string} is too wide, so it

Robert
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