I've seen this most often in Django coding. Suppose the following file: ------------------------------ snip ------------------------------ from django.conf.urls import patterns, include, url from django.contrib import admin from myapp import views urlpatterns = patterns('', url(r'^$', views.index), ) ------------------------------ snip ------------------------------ When I try to change the "url..." line to ------------------------------ snip ------------------------------ url(r'^$', views.index, name="myapp_index"), ------------------------------ snip ------------------------------ the moment I type the comma, the whole line bounces way over to the left. Is this a bug? Is there a way to turn this off? It is highly distracting. (For what it is worth, I've seen the same issue in Windows Emacs.) 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 3.8.2) of 2013-07-26 on roseapple, modified by Debian Windowing system distributor `The X.Org Foundation', version 11.0.11405000 System Description: Linux Mint 16 Petra 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,-Bsymbolic-functions -Wl,-z,relro' 'CPPFLAGS=-D_FORTIFY_SOURCE=2'' Important settings: value of $LANG: en_US.UTF-8 locale-coding-system: utf-8-unix default enable-multibyte-characters: t Major mode: Python Minor modes in effect: shell-dirtrack-mode: t my-keys-minor-mode: t global-undo-tree-mode: t tabbar-mode: t recentf-mode: t global-linum-mode: t linum-mode: t fci-mode: t desktop-save-mode: t tooltip-mode: t mouse-wheel-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: s e

r e s t u r n SPC H t t p R e s p o n s e ( ' H e l l o ' ) C-x C-s

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C-h v i n d e n t - l i n e - f u n c t i o n

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M-x r e p o r t - e m a c s - b u g Recent messages: Can't guess python-indent-offset, using defaults: 4 Saving file /home/adam/django_projs/ros/character/views.py... Wrote /home/adam/django_projs/ros/character/views.py scroll-up-command: End of buffer Mark set [2 times] Auto-saving...done Saving file /home/adam/django_projs/ros/ros/urls.py... Wrote /home/adam/django_projs/ros/ros/urls.py Type "q" in help window to restore its previous buffer. Auto-saving...done Load-path shadows: /home/adam/.emacs.d/elpa/python-django-20131214.1841/python-django hides ~/.emacs.d/lib/python-django /home/adam/.emacs.d/elpa/undo-tree-0.6.5/undo-tree hides ~/.emacs.d/lib/undo-tree ~/.emacs.d/elisp/virtualenv hides ~/.emacs.d/lib/virtualenv /usr/share/emacs/24.3/site-lisp/debian-startup hides /usr/share/emacs/site-lisp/debian-startup ~/.emacs.d/lib/indent hides /usr/share/emacs/24.3/lisp/indent /usr/share/emacs24/site-lisp/dictionaries-common/ispell hides /usr/share/emacs/24.3/lisp/textmodes/ispell /usr/share/emacs24/site-lisp/dictionaries-common/flyspell hides /usr/share/emacs/24.3/lisp/textmodes/flyspell Features: (shadow sort mail-extr emacsbug message rfc822 mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mail-utils tramp-cache tramp tramp-compat auth-source eieio byte-opt bytecomp byte-compile cconv gnus-util mm-util mail-prsvr password-cache tramp-loaddefs cl-macs gv shell pcomplete format-spec pp misearch multi-isearch python-django sql thingatpt json hippie-exp help-mode haskell-font-lock haskell-mode haskell-string haskell-sort-imports haskell-align-imports cl noutline outline flymake compile dabbrev disp-table python rx comint ring ansi-color sh-script smie executable vc-git util undo-tree diff tabbar indent revbufs recentf tree-widget wid-edit linum ido framemove advice help-fns cl-lib advice-preload fill-column-indicator easy-mmode desktop haskell-mode-autoloads edmacro kmacro info easymenu ov-autoloads finder-inf python-django-autoloads undo-tree-autoloads package misterioso-theme time-date tooltip 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 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 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 dynamic-setting system-font-setting font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)