bug#15854: 24.3.50; cperl-mode: Support for outlining (much like that in perl-mode)

[Jambunathan K <kjambunathan@gmail.com>]

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This is either a bug or a feature request.

Summary: cperl-mode: Support for outlining (much like that in perl-mode)

1. Add this to your .emacs

      (add-hook 'perl-mode-hook 'outline-minor-mode)
      (add-hook 'cperl-mode-hook 'outline-minor-mode)

      (add-hook 'outline-minor-mode-hook
        (lambda ()
          (define-key outline-minor-mode-map [(control tab)] 'org-cycle)
          ;; (define-key outline-minor-mode-map [(shift tab)] 'org-global-cycle)
          (define-key outline-minor-mode-map [backtab] 'org-global-cycle)
          ))

2. C-x C-f org.pl
3. M-x perl-mode

4. Do this <S-iso-lefttab>, <S-iso-lefttab>

   See the attached screenshot for what I get.

5. M-x cperl-mode
6. Repeat step 4.

   Nothing interesting happens.  Only thing I see is this message.

      --8<---------------cut here---------------start------------->8---
         hide-sublevels: Must keep at least one level of headers [3 times]
      --8<---------------cut here---------------end--------------->8---


Expected behaviour
==================

I should be able to "cycle" through the visibility.


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----------------------------------------------------------------
In GNU Emacs 24.3.50.4 (i686-pc-linux-gnu, GTK+ Version 2.20.1)
 of 2013-11-09 on debian-6.05
Bzr revision: 115051 jan.h.d@swipnet.se-20131109111953-cysfi19meuidy96q
Windowing system distributor `The X.Org Foundation', version 11.0.10707000
System Description:	Debian GNU/Linux 6.0.5 (squeeze)