Gnus: Improve subthread sorting;

 make subthread sorting customizable and add docs for it

* doc/misc/gnus.texi (Sorting the Summary Buffer): Document new defcustom
`gnus-subthread-sort-functions' and remove the obsolete documentation
of `gnus-sort-threads-recursively'.

* lisp/gnus/gnus-sum.el (gnus-subthread-sort-functions): New defcustom.
(gnus-sort-threads-recursively): Delete defcustom.
(gnus-sort-threads-recursive): Adapt accordingly.

* lisp/gnus/gnus-sum.el (gnus-sort-subthreads-recursive): New function.
(gnus-sort-threads-recursive): Use it.
(gnus-sort-threads): Unconditionally call `gnus-sort-threads-recursive'
again.  Now that determines how to sort subthreads.

1 files changed, 7 insertions, 1 deletions

diff --git a/doc/misc/ChangeLog b/doc/misc/ChangeLog
index b306ce5ba0a..9b45ac06f4c 100644
--- a/doc/misc/ChangeLog
+++ b/doc/misc/ChangeLog
@@ -1,4 +1,10 @@
-2013-07-29  David Engster <deng@randomsample.de>
+2013-07-30  Tassilo Horn  <tsdh@gnu.org>
+
+        * gnus.texi (Sorting the Summary Buffer): Document new defcustom
+        `gnus-subthread-sort-functions' and remove the obsolete documentation
+        of `gnus-sort-threads-recursively'.
+
+2013-07-29  David Engster  <deng@randomsample.de>
 
         * eieio.texi (top): Make clear that EIEIO is not a full CLOS
         implementation.