Emacs 24.2.90.1 (previous-line) behavior

[Ken Brown]

On 1/21/2013 4:53 PM, michael@mauger.com wrote:
> I'm using the test version of Emacs so that I could use Emacs-w32
> (Cygwin file and resource services with a W32 gui).  I'm a heavy emacs
> user on my GNU/Linux boxes; Unfortunately, I'm relegated to Windows7 at
> work.  The problem I'm having only impacts the test 24.2.90 environment,
> not the standard 24.2 version in Cygwin (where ther is no emacs-w32).
>
> The only problem I've encountered is that (previous-line) aka, up arrow
> or Control-P (<up>, C-p in emacs-speak) sometimes jumps up two lines
> rather than one.  Luckily I'm a lousy typist and I keep an eye on the
> screen so I quickly compensate with a down arrow but it is slowly
> driving me nuts...
>
> The reason I know it's not the idiot on the push button side of the
> keyboard is that I have a customization that I've used for years that
> copies the remainder of the line above to the current line.  It now
> mangles the current and previous lines under this version of Cygwin.
> I've had similar problems near the window boundaries due to scrolling
> during re-display interacting with cursor motion but in customization
> the behavior disappears because there is no intervening re-display.
>
> Also, I'm having the problem in emacs-w32, emacs-x11 and emacs-nox
> executables.
>
> I did not encounter this problem with any of the pretest versions of
> 24.3 (which is what 24.2.90 is) on GNU/Linux.  And while I guess this is
> not a Cygwin core bug, I expect it might be a bug in packaging of the
> pretest.  I know emacs-w32 is a new beast in the GNU Emacs universe so
> if the problem is really in the Emacs code base I'd like to see it
> acknowledged and fixed before it causes problems for emacs on other
> platforms.

I've never seen this problem.  Can you give a recipe for reproducing it 
starting with `emacs-nox -Q'?

Ken

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