GNU Emacs 22.0.99.1 (i386-mingw-nt5.1.2600) of 2007-04-24: cua-mode interfers with comment-region

GNU Emacs 22.0.99.1 (i386-mingw-nt5.1.2600) of 2007-04-24: cua-mode interfers with comment-region

[Eric Lilja]

Hello! Don't know if this is a bug or if this is supposed to happen, but 
here it goes...
I'm using the Emacs' version mentioned in the subject.

Say I do:
emacs -Q foo.cpp&
type, for example, #include, select it with the mouse then issue 
comment-region with C-c C-c, the selection is instantly commented out

If I try this again, but just before performing comment-region, I enable 
cua-mode: M-x cua-mode, what happens after I perform comment-region is 
that the minibuffer (correct name?) displays C-c- as if only the first 
C-c was registered if I type C-c again the region is commented out. So 
put it short, with cua-mode enabled I have to type C-c three times in a 
CC-mode buffer to comment out the selected region.

I have no routine in filing bug reports, so please be gentle. I must 
also admit I have little clue actually what cua-mode does, but I was 
told to enable it for nxhtml.

- Eric

Re: GNU Emacs 22.0.99.1 (i386-mingw-nt5.1.2600) of 2007-04-24: cua-mode interfers with comment-region

[Robert J. Chassell]

      emacs -Q foo.cpp&
      type, for example, #include, select it with the mouse then issue 
      comment-region with C-c C-c, the selection is instantly commented out

Yes.  `comment-region' sees the region that you selected, as it
should, and when you invoke it, comments that region out.

(emacs)CUA Bindings says

    The command `M-x cua-mode' sets up key bindings that are
    compatible with the Common User Access (CUA) system used in many
    other applications.  `C-x' means cut (kill), `C-c' copy, `C-v'
    paste (yank), and `C-z' undo.  Standard Emacs commands like `C-x
    C-c' still work, because `C-x' and `C-c' only take effect when the
    mark is active (and the region is highlighted). ...

Following your instructions, the mark is active, so C-c should mean `copy'.
Info goes on to say

    To enter an Emacs command like `C-x C-f' while the mark is active,
    use one of the following methods: either hold `Shift' together
    with the prefix key, e.g. `S-C-x C-f', or quickly type the prefix
    key twice, e.g. `C-x C-x C-f'.

Both `S-C-c C-c' and `C-c C-c C-c' succeed in commenting the region.

      Hello! Don't know if this is a bug or if this is supposed to
      happen ...

`comment-region' is supposed to comment a region, so this is supposed
to happen.

-- 
    Robert J. Chassell                          GnuPG Key ID: 004B4AC8
    bob@rattlesnake.com                         bob@gnu.org
    http://www.rattlesnake.com                  http://www.teak.cc

Re: GNU Emacs 22.0.99.1 (i386-mingw-nt5.1.2600) of 2007-04-24: cua-mode interfers with comment-region

[Eric Lilja]

Robert J. Chassell wrote:
>       emacs -Q foo.cpp&
>       type, for example, #include, select it with the mouse then issue 
>       comment-region with C-c C-c, the selection is instantly commented out
> 
> Yes.  `comment-region' sees the region that you selected, as it
> should, and when you invoke it, comments that region out.
> 
> (emacs)CUA Bindings says
> 
>     The command `M-x cua-mode' sets up key bindings that are
>     compatible with the Common User Access (CUA) system used in many
>     other applications.  `C-x' means cut (kill), `C-c' copy, `C-v'
>     paste (yank), and `C-z' undo.  Standard Emacs commands like `C-x
>     C-c' still work, because `C-x' and `C-c' only take effect when the
>     mark is active (and the region is highlighted). ...
> 
> Following your instructions, the mark is active, so C-c should mean `copy'.
> Info goes on to say
> 
>     To enter an Emacs command like `C-x C-f' while the mark is active,
>     use one of the following methods: either hold `Shift' together
>     with the prefix key, e.g. `S-C-x C-f', or quickly type the prefix
>     key twice, e.g. `C-x C-x C-f'.
> 
> Both `S-C-c C-c' and `C-c C-c C-c' succeed in commenting the region.
> 
>       Hello! Don't know if this is a bug or if this is supposed to
>       happen ...
>


> `comment-region' is supposed to comment a region, so this is supposed
> to happen.
> 

Umm, yes, I realise that, my question was if it's expected to require 
the command C-c C-c C-c to perform it instead of C-c C-c after 
activating cua-mode, and it seems it is expected. Thanks for your reply.

Re: GNU Emacs 22.0.99.1 (i386-mingw-nt5.1.2600) of 2007-04-24: cua-mode interfers with comment-region

[Stefan Monnier]

> comment-region with C-c C-c, the selection is instantly commented out

If you use transient-mark-mode, I recommend you use M-; instead of C-c C-c,
since it's supported in every mode (and it avoids the C-c issue you have
with cua-mode).

> I have no routine in filing bug reports, so please be gentle.  I must also
> admit I have little clue actually what cua-mode does, but I was told to
> enable it for nxhtml.

IMNSHO No mode (such as nxhtml) should require (or even recommend) cua-mode.
If nxhtml does that, I'd report it as a bug.


        Stefan