bug#14595: Erroneous composition of lambda in emacs-lisp buffers with prog-prettify-symbols enabled

[Ted Zlatanov]

On Sun, 16 Jun 2013 05:01:48 +0200 Juanma Barranquero <lekktu@gmail.com> wrote: 

JB> On Sun, Jun 16, 2013 at 4:50 AM, Eli Zaretskii <eliz@gnu.org> wrote:
>> I wasn't aware of any inconsistent display or scrolling behavior in
>> his description.  Juanma, can you repeat that description, which I
>> probably missed?

JB> With a file containing 1000 identical lines "(lambda (x) x)", the
JB> lambdas that were incorrectly composed depend on the direction you
JB> scroll the buffer. Scrolling from the beginning towards the end (page
JB> by page), I got about 30 errors, always in the same positions
JB> (distributed non-uniformly). If you repeat the experiment, but go
JB> immediately to the end and scroll up, you got a different number of
JB> errors (double or so) at different possitions, also consistents from
JB> one run to the next.

JB> I suppose that's what Ted is talking about.

Yes.  Again, I don't know if this is a problem worth fixing, I was just
clarifying how it's inconsistent depending on the scroll direction.

Ted