bug#22638: 24.5; Double import on completion in python mode

[Vadim Suharnikov]

Steps for reproduce:

* start emacs: emacs -Q

* create an empty python buffer: C-x b foo.py RET

* turn on python mode: M-x python-mode RET

* start interpreter: C-c C-z (python-shell-switch-to-shell) and answer the

prompts (I pressed RET n)

* switch back to python buffer: C-x o (other-window)

* type "from os import " (there is a space after "import")

* press C-M-i (completion-at-point)

Observed behaviour: "import " is inserted in the buffer. The buffer now

contains "from os import import ".

Expected behaviour: completion-at-point offers names from the os module

as completion candidates.

In GNU Emacs 24.5.1 (x86_64-pc-linux-gnu, GTK+ Version 2.24.29)

of 2016-01-26 on fort_dey

Windowing system distributor `The X.Org Foundation', version 11.0.11800000

System Description: Gentoo Base System release 2.2

Configured using:

`configure --prefix=/usr --build=x86_64-pc-linux-gnu

--host=x86_64-pc-linux-gnu --mandir=/usr/share/man

--infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc

--localstatedir=/var/lib --disable-dependency-tracking

--disable-silent-rules --libdir=/usr/lib64 --program-suffix=-emacs-24

--infodir=/usr/share/info/emacs-24 --localstatedir=/var

--enable-locallisppath=/etc/emacs:/usr/share/emacs/site-lisp

--with-gameuser=:gamestat --without-compress-install

--with-file-notification=inotify --enable-acl --with-dbus

--without-gnutls --with-gpm --without-hesiod --without-kerberos

--without-kerberos5 --without-xml2 --without-selinux --without-wide-int

--with-zlib --with-sound=alsa --with-x --without-ns --without-gconf

--without-gsettings --without-toolkit-scroll-bars --with-gif

--with-jpeg --with-png --with-rsvg --with-tiff --with-xpm

--without-imagemagick --with-xft --without-libotf --without-m17n-flt

--with-x-toolkit=gtk2 GENTOO_PACKAGE=app-editors/emacs-24.5-r1

'CFLAGS=-march=native -O2 -pipe -nopie' CPPFLAGS= 'LDFLAGS=-Wl,-O1

-Wl,--as-needed''

Important settings:

value of $LC_ALL:

value of $LANG: ru_RU.utf8

locale-coding-system: utf-8-unix

Major mode: Python

Minor modes in effect:

tooltip-mode: t

electric-indent-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 messages:

C-x C-g is undefined

Quit [3 times]

Make dedicated process? (y or n) n

Sent python-shell-completion-setup-code

Sent python-ffap-setup-code

Sent python-eldoc-setup-code

No match

Making completion list...

Quit

Making completion list...

Load-path shadows:

None found.

Features:

(shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml

mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev

gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util

help-fns mail-prsvr mail-utils compile cl-extra help-mode python

easymenu json comint ring cl-loaddefs cl-lib ansi-color time-date

cyril-util tooltip electric uniquify ediff-hook vc-hooks lisp-float-type

mwheel x-win x-dnd tool-bar dnd fontset image regexp-opt fringe

tabulated-list newcomment lisp-mode prog-mode register page menu-bar

rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax

facemenu font-core frame cham georgian utf-8-lang misc-lang vietnamese

tibetan thai tai-viet lao korean japanese hebrew greek romanian slovak

czech european ethiopic indian cyrillic chinese case-table epa-hook

jka-cmpr-hook help simple abbrev minibuffer nadvice loaddefs button

faces cus-face macroexp files text-properties overlay sha1 md5 base64

format env code-pages mule custom widget hashtable-print-readable

backquote make-network-process dbusbind inotify dynamic-setting

font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)

Memory information:

((conses 16 86333 7207)

(symbols 48 18744 0)

(miscs 40 59 199)

(strings 32 12885 4754)

(string-bytes 1 391566)

(vectors 16 10730)

(vector-slots 8 400620 7751)

(floats 8 69 423)

(intervals 56 343 0)

(buffers 960 14)

(heap 1024 13190 827))