bug#25654: 24.5; linum and hide-show

[Abdul-Lateef Haji-Ali <hajiali@maths.ox.ac.uk>]

When working on huge files, it seems that when hide-show collapses a
large multi-line block, linum still creates hidden overlays for every
line in the hidden block leading to unresponsive emacs. To reproduce:
Create a new file, enable c-mode, hs-minor-mode and
linum-mode, create a huge block by typing: { C-u 10000 RET } then
execute hs-hide-all and watch Emacs become unresponsive.




In GNU Emacs 24.5.1 (x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
 of 2016-04-17 on lgw01-04, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11804000
System Description:	Ubuntu 16.04.1 LTS

Configured using:
 `configure --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/24.5/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.5/site-lisp:/usr/share/emacs/site-lisp
 --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/24.5/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.5/site-lisp:/usr/share/emacs/site-lisp
 --with-x=yes --with-x-toolkit=gtk3 --with-toolkit-scroll-bars
 'CFLAGS=-g -O2 -fstack-protector-strong -Wformat
 -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time
 -D_FORTIFY_SOURCE=2' 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro''

Important settings:
  value of $LANG: en_GB.UTF8
  locale-coding-system: utf-8

Major mode: Python

Minor modes in effect:
  subword-mode: t
  guru-mode: t
  auto-dim-other-buffers-mode: t
  highlight-indentation-mode: t
  elpy-mode: t
  pyvenv-mode: t
  global-auto-complete-mode: t
  auto-complete-mode: t
  global-linum-mode: t
  linum-mode: t
  better-registers: t
  show-paren-mode: t
  server-mode: t
  yas-minor-mode: t
  TeX-PDF-mode: t
  global-flycheck-mode: t
  flycheck-mode: t
  which-function-mode: t
  global-company-mode: t
  company-mode: t
  helm-mode: t
  helm-descbinds-mode: t
  async-bytecomp-package-mode: t
  flx-ido-mode: t
  ido-ubiquitous-mode: t
  editorconfig-mode: t
  global-diff-hl-mode: t
  diff-hl-mode: t
  diff-auto-refine-mode: t
  winner-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  whitespace-mode: t
  global-anzu-mode: t
  anzu-mode: t
  projectile-mode: t
  flyspell-mode: t
  volatile-highlights-mode: t
  global-hl-line-mode: t
  recentf-mode: t
  savehist-mode: t
  show-smartparens-global-mode: t
  show-smartparens-mode: t
  smartparens-global-mode: t
  smartparens-mode: t
  global-auto-revert-mode: t
  delete-selection-mode: t
  prelude-global-mode: t
  prelude-mode: t
  which-key-mode: t
  beacon-mode: t
  shell-dirtrack-mode: t
  tooltip-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  hs-minor-mode: t

Recent messages:
Quit
Mark set [3 times]
Saving file /home/hajiali/Work/Projects/nested_var/code/plot_compare.py...
Wrote
/tmp/.!home!hajiali!Work!Projects!nested_var!code!plot_compare.py.~undo-tree~
Wrote /home/hajiali/Work/Projects/nested_var/code/plot_compare.py
Mark set
Mark saved where search started
Saving file /home/hajiali/Work/Projects/nested_var/code/plot_compare.py...
Wrote
/tmp/.!home!hajiali!Work!Projects!nested_var!code!plot_compare.py.~undo-tree~
Wrote /home/hajiali/Work/Projects/nested_var/code/plot_compare.py

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/usr/share/emacs/site-lisp/auctex/tex-style
/home/hajiali/.emacs.d/elpa/auctex-11.89.8/tex-info hides
/usr/share/emacs/site-lisp/auctex/tex-info
/home/hajiali/.emacs.d/elpa/auctex-11.89.8/tex-mik hides
/usr/share/emacs/site-lisp/auctex/tex-mik
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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 misearch multi-isearch
easy-kill vc-git superword subword editorconfig-core
editorconfig-core-handle editorconfig-fnmatch cc-langs helm-command
company-anaconda anaconda-mode pythonic f tramp-sh rainbow-mode color
rainbow-delimiters elisp-slime-nav guru-mode face-remap
auto-dim-other-buffers smyx-theme setup-org setup-python
highlight-indentation flymake elpy pyvenv elpy-django elpy-refactor
python-el-fgallina-expansions smartparens-python python files-x
setup-helm setup-useful-functions setup-outline setup-markdown
setup-latex setup-ibuffer setup-file-management dired+ image-file
setup-autocomplete auto-complete-config auto-complete popup
setup-various linum better-registers hungry-delete paren smartscan
server visual-regexp-steroids visual-regexp prelude-yaml prelude-shell
sh-script smie prelude-scheme geiser prelude-python prelude-perl
prelude-org prelude-latex company-auctex yasnippet latex-mode-expansions
latex tex-ispell tex-style tex dbus crm smartparens-latex prelude-js
js2-mode-expansions js2-mode js2-old-indent html-mode-expansions
smartparens-html sgml-mode js-mode-expansions js cc-mode-expansions
cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine
prelude-emacs-lisp prelude-lisp prelude-c prelude-programming flycheck
find-func help-mode subr-x which-func prelude-company company-oddmuse
company-keywords company-etags company-gtags company-dabbrev-code
company-dabbrev company-files company-capf company-cmake company-xcode
company-clang company-semantic company-eclim company-template
company-css company-nxml company-bbdb company pcase
prelude-helm-everywhere helm-mode helm-descbinds helm-eshell helm-elisp
helm-eval edebug prelude-helm helm-projectile helm-files image-dired
dired-aux ffap helm-tags helm-bookmark helm-adaptive helm-info
helm-external helm-net xml url url-proxy url-privacy url-expand
url-methods url-history url-cookie url-domsuf url-util mailcap
helm-buffers helm-grep helm-regexp helm-elscreen helm-locate helm-types
helm-imenu helm-utils helm-help helm helm-source helm-multi-match
helm-lib helm-config helm-easymenu async-bytecomp async prelude-ido smex
flx-ido flx ido-ubiquitous ido-completing-read+ cus-edit cus-start
cus-load prelude-global-keybindings prelude-editor editorconfig
operate-on-number calc-bin calc-ext calc calc-loaddefs calc-macs diff-hl
smartrep vc-dir ewoc vc vc-dispatcher diff-mode winner undo-tree diff
esh-var esh-io esh-cmd esh-opt esh-ext esh-proc esh-arg esh-groups
eshell esh-module esh-mode esh-util re-builder whitespace tabify
browse-kill-ring derived midnight ediff-merg ediff-wind ediff-diff
ediff-mult ediff-help ediff-init ediff-util ediff dired-x dired anzu avy
projectile grep ibuf-ext ibuffer bookmark pp expand-region
text-mode-expansions er-basic-expansions expand-region-core
expand-region-custom flyspell ispell rect etags volatile-highlights
hl-line windmove recentf tree-widget wid-edit savehist saveplace
diminish smartparens-config smartparens-ess smartparens autorevert
filenotify delsel prelude-mode edmacro kmacro crux tramp tramp-compat
tramp-loaddefs trampver imenu-anywhere imenu prelude-core epl ov
prelude-ui which-key beacon seq seq-24 smart-mode-line mule-util
rich-minority prelude-custom prelude-packages finder-inf gh-common
gh-profile url-parse auth-source gnus-util mm-util mail-prsvr
password-cache url-vars rx s ucs-normalize marshal ht json dash eieio
byte-opt bytecomp byte-compile cl-extra cconv eieio-core info package
epg-config cl-macs proof-site proof-autoloads pg-vars mmm-auto mmm-vars
mmm-compat haskell-mode-autoloads ido ess-toolbar ess-mouse mouseme
thingatpt browse-url ess-menu ess-swv ess-noweb ess-noweb-font-lock-mode
ess-bugs-l essd-els ess-sas-d ess-sas-l ess-sas-a shell pcomplete
ess-sta-d ess-sta-l cc-vars cc-defs make-regexp ess-sp6-d ess-sp3-d
ess-julia ess-r-d ess-r-syntax ess-r-completion ess-tracebug format-spec
ess-roxy advice hideshow ess-help ess-developer eldoc help-fns ess-s-l
ess ess-inf compile comint ansi-color ring ess-mode ess-noweb-mode
ess-utils cl gv cl-loaddefs cl-lib ess-custom executable easymenu
ess-compat ess-site emacs-goodies-el emacs-goodies-custom
emacs-goodies-loaddefs easy-mmode preview-latex tex-site auto-loads
time-date 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 gfilenotify dynamic-setting
system-font-setting font-render-setting move-toolbar gtk x-toolkit x
multi-tty emacs)

Memory information:
((conses 16 751094 503592)
 (symbols 48 68250 2)
 (miscs 40 2756 1963)
 (strings 32 165400 286642)
 (string-bytes 1 4853566)
 (vectors 16 84943)
 (vector-slots 8 1283570 188529)
 (floats 8 900 1471)
 (intervals 56 2975 1528)
 (buffers 960 18)
 (heap 1024 101744 35949))