bug#18324: plots hang in inferior octave mode

[John Lawrence Aspden <john@aspden.com>]

Hi, I'm finding that plot windows freeze running octave in inferior-octave mode

GNU Emacs 24.3.1
GNU Octave, version 3.8.1

Start Emacs
$ emacs -Q

Start an Inferior Octave Process
M-x run-octave

Octave Commands to produce plot
x=1:10
plot(x)

Plot window is frozen. The same commands entered directly into octave
in a terminal or octave started in emacs shell mode work fine.

Thanks, John.


If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
For information about debugging Emacs, please read the file
/usr/share/emacs/24.3/etc/DEBUG.


In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, GTK+ Version 3.12.2)
 of 2014-06-06 on barber, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11600000
System Description:	Debian GNU/Linux testing (jessie)

Configured using:
 `configure '--build' 'x86_64-linux-gnu' '--build' 'x86_64-linux-gnu'
 '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib'
 '--localstatedir=/var/lib' '--infodir=/usr/share/info'
 '--mandir=/usr/share/man' '--with-pop=yes'
 '--enable-locallisppath=/etc/emacs24:/etc/emacs:/usr/local/share/emacs/24.3/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.3/site-lisp:/usr/share/emacs/site-lisp'
 '--with-crt-dir=/usr/lib/x86_64-linux-gnu' '--with-x=yes'
 '--with-x-toolkit=gtk3' '--with-toolkit-scroll-bars'
 'build_alias=x86_64-linux-gnu' 'CFLAGS=-g -O2 -fstack-protector
 --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wall'
 'LDFLAGS=-Wl,-z,relro' 'CPPFLAGS=-D_FORTIFY_SOURCE=2''

Important settings:
  value of $LANG: en_GB.UTF-8
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Inferior Octave

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
M-x r u n - c o <backspace> <backspace> o c t a v e
<return> x = 1 : 1 0 <return> p l o t ( x ) <return>
<help-echo> <help-echo> <help-echo> <down-mouse-1>
<mouse-1> <up> <down> M-p <return> <help-echo> <help-echo>
<help-echo> <help-echo> M-x r e p o r t - e m a c s
- b u g <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
History item: 1

Load-path shadows:
None found.

Features:
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mail-prsvr mail-utils octave-inf comint ansi-color ring octave-mod smie
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x-win x-dnd tool-bar dnd fontset image regexp-opt fringe tabulated-list
newcomment lisp-mode register page menu-bar rfn-eshadow timer select
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