Synch with Gnus trunk:

Synch with Gnus trunk:
2009-10-19  Katsumi Yamaoka  <yamaoka@jpl.org>

 * gnus-sum.el (gnus-summary-show-thread): Remove useless goto-char.
 (gnus-summary-show-thread, gnus-summary-hide-thread): Indent.

2009-10-16  Katsumi Yamaoka  <yamaoka@jpl.org>

 * gnus.el (gnus-overlay-get): New alias to overlay-get.
 (gnus-overlays-in): New alias to overlays-in.

 * gnus-sum.el (gnus-remove-overlays): Use gnus-overlays-in,
 gnus-overlay-get, and gnus-delete-overlay.
 (gnus-summary-show-thread): Make it work as well for systems in which
 next-single-char-property-change is not available.
 (gnus-summary-hide-thread): Use gnus-make-overlay and gnus-overlay-put.

2009-10-14  Reiner Steib  <Reiner.Steib@gmx.de>

 * gnus-sum.el (gnus-remove-overlays): Add doc string and alias.

2009-10-14  Dan Nicolaescu  <dann@ics.uci.edu>

 * gnus-sum.el (gnus-remove-overlays): Compatibility code for Emacs 21
 and XEmacs that don't have `remove-overlays'.

2009-10-14  Stefan Monnier  <monnier@iro.umontreal.ca>

 * gnus-sum.el (gnus-summary-mode, gnus-summary-show-all-threads)
 (gnus-summary-show-thread, gnus-summary-hide-thread): Get rid of
 selective display.  Use overlays instead.