bug#5581: 23.1; Gnus does not use IMAP unread count

[Julien Danjou]

Currently, gnus keep track of the number of unread mail by using its .newrc, 
AFAIU.
While this is the only method for nntp, this it totally wrong with IMAP.

It'd be nice to have a way to at least configure that so it just asks to the
IMAP server how many new mails there is in the box, rather to trying
to count it itself.



In GNU Emacs 23.1.1 (x86_64-pc-linux-gnu, GTK+ Version 2.18.6)
 of 2010-01-27 on brahms, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.10704000
configured using `configure  '--build=x86_64-linux-gnu' 
'--host=x86_64-linux-gnu' '--prefix=/usr' '--sharedstatedir=/var/lib' 
'--libexecdir=/usr/lib' '--localstatedir=/var/lib' '--infodir=/usr/share/info' 
'--mandir=/usr/share/man' '--with-pop=yes' 
'--enable-locallisppath=/etc/emacs23:/etc/emacs:/usr/local/share/emacs/23.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/23.1/site-lisp:/usr/share/emacs/site-lisp:/usr/share/emacs/23.1/leim'
 '--with-x=yes' '--with-x-toolkit=gtk' '--with-toolkit-scroll-bars' 
'build_alias=x86_64-linux-gnu' 'host_alias=x86_64-linux-gnu' 'CFLAGS=-DDEBIAN 
-g -O2' 'LDFLAGS=-g' 'CPPFLAGS=''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: en_US.UTF-8
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Group

Minor modes in effect:
  gnus-topic-mode: t
  gnus-undo-mode: t
  iswitchb-mode: t
  show-paren-mode: t
  global-hl-line-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
M-x r e p o r <tab> <return>

Recent messages:
Opening nnfolder server on archive...done
Reading active file from archive via nnfolder...done
Opening nnimap server on Naquadah...done
nnimap: Listing subscribed mailboxes on Naquadah...done
Opening nnimap server on Easter-eggs...done
nnimap: Listing subscribed mailboxes on Easter-eggs...done
1 new newsgroup has arrived
Checking new news...
Opening nndoc server on gnus-help...done
Checking new news...done