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bug#8987: 24.0.50; texinfo-insert-menu inserts unnecessary trailing spac

From: emacs18
Subject: bug#8987: 24.0.50; texinfo-insert-menu inserts unnecessary trailing spaces
Date: Sat, 02 Jul 2011 11:42:23 -0700

texinfo-all-menus-update is a command that updates all menus within a
texinfo buffer.  This command calls texinfo-insert-menu in turn to
update each menu.  The problem with the latter is that it inserts
unnecessary white spaces at the end of most menu items following
double-colon.  For example see bzr version 104838 of emacs trunk checked
in on July 1, 2011 where someone checked in cc-mode.texi with trailing
white spaces.

This problem has existed for many years.  I know, because I suffered
through it many times myself.  So I looked for a solution and it seems
like making one line change should fix this as shown below.

In emacs-lisp empty string evaluates to boolean true unlike python,
so that one cannot simply test boolean value of a string to detect
empty string verses non-empty string.  It looks like testing the
(length) being greater than 0 seems to get the job done.

=== modified file 'lisp/textmodes/texnfo-upd.el'
--- lisp/textmodes/texnfo-upd.el        2011-01-25 04:08:28 +0000
+++ lisp/textmodes/texnfo-upd.el        2011-07-02 18:30:47 +0000
@@ -687,7 +687,7 @@
        (insert (format "%s: %s." (car node-part) (cdr node-part)))))
     ;; Insert the description, if present.
-    (when (cdr menu)
+    (when (> (length (cdr menu)) 0)
       ;; Move to right place.
       (indent-to texinfo-column-for-description 2)
       ;; Insert description.

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