[ESS-bugs] ess-mode 5.3.6; C-c C-p enters infinite-ish loop

[Tyler Smith]

I have found that C-c C-p (comint-previous-prompt) fails when the
previous prompt is a long way away. Typical behaviour is emacs
freezing, with top reporting that Emacs is using 90-100% of the
processor. This lasts for a seconds to minutes, and often requires
killing the emacs process. I can reproduce this with the following,
although presumably any long output could produce the same result:

library(vegan)
data(BCI)
BCI
<C-c C-p>

I haven't noticed any problems using C-c C-p in shell mode, but I
don't generally have output of the same magnitude.

Thanks!

Tyler

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[ess-site.el]: ess-customize-alist=nil 
[ess-site.el _2_]: ess-customize-alist=nil 
(S): ess-s-versions-create making M-x defuns for 
 
(R): ess-r-versions-create making M-x defuns for 
 

(R): ess-dialect=nil, buf=*scratch*, start-arg=nil
 current-prefix-arg=nil
(inferior-ess 0): ess-start-args=--no-readline   
ess-setq-vars-default 0: ess-language=Initial, -dialect=nil, buf=nil, comint..echoes=nil, comint..sender=comint-simple-send
ess-setq-vars-default 1: ess-language=S, -dialect=R, buf=nil, comint..echoes=nil, comint..sender=comint-simple-send
(inf-ess 1): lang=S, dialect=R, tmp-dialect=R, buf=*scratch*
(inf-ess 1.1): procname=R temp-dialect=R, buf-name=*R* 
(inferior-ess) Method #3 start=/home/tyler/rworkingdirectory/ buf=*R*
(ess-setq-vars-LOCAL): language=S, dialect=R, buf=nil, comint..echoes=nil, comint..sender=comint-simple-send
(inf-ess 2.1): ess-language=S, ess-dialect=R buf=*R* 
(inf-ess 2.2): start args = --no-readline  , inf-ess-start-args=--no-readline   
(inf-ess finish [S(R), R(nil,nil)]
(ess-multi 0):  inf-ess-start-args=--no-readline  , comint-..echoes=nil
(i-ess 1): buf=*R*, lang=S, comint..echo=nil, comint..sender=comint-simple-send,
(i-ess 2): buf=*R*, lang=S, comint..echo=t, comint..sender=inferior-R-input-sender,
(ess-setq-vars-LOCAL): language=S, dialect=R, buf=nil, comint..echoes=t, comint..sender=inferior-R-input-sender
(i-ess 3): curr-buf=*R*, comint..echo=t, comint..sender=inferior-R-input-sender,
(ess-multi post inf-ess: start-args=--no-readline  , comint-echoes=t
(ess-multi 1):  start-args=--no-readline   
Making Process...Buf *R*, Proc R, Prog R
 Start File=nil, Args= --no-readline  .
(R): inferior-ess-language-start=options(STERM='iESS', editor='emacsclient')


Emacs  : GNU Emacs 22.1.1 (i686-pc-linux-gnu, X toolkit)
 of 2007-06-24 on blackbart
Package: ess-mode 5.3.6

current state:
==============
(setq
 ess-language "S"
 ess-dialect "R"
 ess-ask-for-ess-directory t
 ess-ask-about-transfile nil
 ess-directory nil
 ess-keep-dump-files "always"
 ess-source-directory "/tmp/"
 )