GNU bug report logs - #11298
24.0.95; (WISH) Re-look scratch buffers

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From: martin rudalics <rudalics <at> gmx.at>
To: Jambunathan K <kjambunathan <at> gmail.com>
Cc: 11298 <at> debbugs.gnu.org
Subject: bug#11298: Recipe to surface *code-conversion-work* buffer
Date: Tue, 24 Apr 2012 13:39:25 +0200

>> This is my little excursion in to killing *scratch* (to death?)
>
> Now I am wondering whether:
> 1. *scratch* buffer re-generates itself

It does because Emacs needs at least one buffer it can display.

> 2. Why some buffers like *code-conversion-work* (and other internal
>    buffers like "Minibuf", "Echo Area") gets /surfaced/ in some buffer
>    listings, but totally disappears in the next buffer listing.

Usually they are not displayed because their names start with a space.

> For want of better place to put this, I am attaching it to *scratch*
> buffer bug report.
>
> Read on.
>
> Steps to reproduce:
> ------------------
>
> 1. Emacs -Q
> 2. C-x b TAB gives me
>     ,----
>     | Click <mouse-2> on a completion to select it.
>     | In this buffer, type RET to select the completion near point.
>     |
>     | Possible completions are:
>     | *Messages*
>     `----
> 3. C-g. Now you are in *scratch*
> 4. Kill *scratch* => *Messages* shows up
> 5. Kill *Messages* => *Completions* shows up
> 6. Kill *Completions* => *scratch* shows up
>
>    Now I get confused.  Why does *scratch* show up again. Didn't I kill
>    it before?

Because when you killed the last other buffer whose name didn't start
with a space, *scratch* got regenerated.

> 7. C-x b TAB TAB gets me this
>     ,----
>     | Click <mouse-2> on a completion to select it.
>     | In this buffer, type RET to select the completion near point.
>     |
>     | Possible completions are:
>     |  *Echo Area 0* 	 *Echo Area 1*
>     |  *Minibuf-0* 	 *Minibuf-1*
>     |  *code-conversion-work*
>     `----
>
>    I choose to examine *code-conversion-work*.  The name seems
>    interesting.  This is what I see there when I visit it:
>
>     ,----
>     | c:/Program Files/emacs-24.0.95/lisp/emacs-lisp/easymenu.elc
>     `----
>

Usually, buffers whose names start with a space are not proposed.  But
since you killed all other buffers what do you want Emacs to propose?

> 8. C-x b TAB now shows
>     ,----
>     | Click <mouse-2> on a completion to select it.
>     | In this buffer, type RET to select the completion near point.
>     |
>     | Possible completions are:
>     | *Completions*
>     | *Messages*
>     | *scratch*
>     `----
>
>    Note that special buffers that show up in step 7 has disappeared.

Because these buffer have been recreated in the meantime.

Is there anything bad about the behavior you observed?

martin

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