Re: 21.3: end-of-buffer resets mark

[Kevin Rodgers]

Bjoern Milcke wrote:

> Do the following:
>
> 1. `set-mark-command'         (C-SPC)
> 2. `next-line'                (down)
> 3. `end-of-buffer'            (C-end, non-standard key?)
> 4. `exchange-point-and-mark'  (C-x C-x)
>
> => you will notice that the mark is at the point from where you
>    called `end-of-buffer' and not the line above where you called
>    `set-mark-command'.


`C-u SPC C-u SPC' after or instead of `C-x C-x' will get you back to your first
mark.


> ,----[ C-h f end-of-buffer ]
> | end-of-buffer is an interactive compiled Lisp function in `simple'.
> | (end-of-buffer &optional ARG)
> | 
> | Move point to the end of the buffer; leave mark at previous position.
> | With arg N, put point N/10 of the way from the end.
> | 
> | If the buffer is narrowed, this command uses the beginning and size
> | of the accessible part of the buffer.
> | 
> | Don't use this command in Lisp programs!
> | (goto-char (point-max)) is faster and avoids clobbering the mark.
> `----
>
> Does 'leave mark at previous position' mean set it to the current
> point when calling?  If so, why is this implemented this way?  Or
> how could it be done differently?

Yes.  Because it's convenient (to be able to return from your position
after taking a quick look at the beginning or end of the buffer).  I
don't know.


> Where can I look, whether bugs are already known (Issuezilla or the
> like)?


Use http://groups.google.com to search gnu.emacs.bug


--
Kevin Rodgers