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bug#17678: 24.4.50; Feature Request -- calculate new `window-start` & `w

From: Keith David Bershatsky
Subject: bug#17678: 24.4.50; Feature Request -- calculate new `window-start` & `window-end` before visual redisplay
Date: Tue, 03 Jun 2014 10:48:54 -0700
User-agent: / () / () APEL/10.8 Emacs/24.4.50 (x86_64-apple-darwin10.8.0) MULE/6.0 (HANACHIRUSATO)

At the present time, I do not believe that Emacs has the ability to calculate a 
new `window-start` and a new `window-end` without a redisplay occurring, 
because it needs to take into account things like the new cursor position, 
`visual-line-mode`, `linenum-mode`, etc.

Functions assigned to the `post-command-hook` use the `window-start` and 
`window-end` positions that were previously visible before a new redisplay 


* Long buffer of text that exceeds the `window-height`.

* Jump interactively from `beginning-of-buffer` to `ending-of-buffer`, or 

* In the `post-command-hook`, have the following two elements:

  ** Remove overlays xyz between the *old* `window-start` and *old* 

  ** Add overlays xyz between the *new* `window-start` and *new* `window-end`.

The final component above (i.e., ** Add overlays xyz between the *new* . . .) 
cannot be done correctly without a forced `redisplay` occurring.  The result of 
a forced redisplay is that the user will see a momentary visual representation 
of the buffer *without* overlays xyz.  The forced redisplay permits Emacs to 
correctly calculate the *new* `window-start` and *new* `window-end`.

In a stackoverflow thread regarding this issue, @Stefan suggested that I take a 
look at the `jit-lock-register`.  After combing through the code in 
`jit-lock.el` and trying some experiments, I believe that `jit-lock.el` is more 
suited to a situation when buffer *modification* occurs -- it is also suited 
for situations where one may wish to incrementially act upon an entire buffer 
in small chunks at a time to increase efficiency of avaialble resources.


I believe that the solution may be to have a `sneak-preview-redisplay` whereby 
the *new* `window-start` and *new* `window-end` could be correctly calculated 
without the visual buffer actually being redisplayed.




In GNU Emacs (x86_64-apple-darwin10.8.0, NS appkit-1038.36 Version 
10.6.8 (Build 10K549))
 of 2014-06-01 on MP.local
Repository revision: 117215 address@hidden
Windowing system distributor `Apple', version 10.3.1038
Configured using:
 `configure --with-ns'

Configured features:

Important settings:
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  lawlist-scroll-bar-mode: t
  lawlist-delete-selection-mode: t
  lawlist-linum-mode: t
  lawlist-visual-line-mode: t
  vr-mode: t
  hr-mode: t
  flyspell-mode: t
  desktop-save-mode: t
  tabbar-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  transient-mark-mode: t

Recent input:
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <M-right> <M-right> <M-right> <M-right> <M-right> 
<M-right> <M-right> <M-right> <M-right> <M-right> <M-right> 
<M-right> <M-right> <M-right> <M-right> <M-right> <M-right> 
<M-right> <M-right> <M-right> <M-right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <right> <right> 
<right> <right> <right> <right> <right> <M-right> <M-right> 
<M-right> <M-right> <M-right> <M-right> <M-right> <M-right> 
<M-right> <s-up> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <up> <M-right> <M-right> <M-right> 
<M-right> <M-right> <M-right> <M-right> <M-right> <M-right> 
<M-right> <M-right> <M-right> <M-right> <M-right> <M-right> 
<M-right> <M-right> <M-right> <M-right> <M-right> <M-right> 
<M-right> <M-right> <M-right> <M-right> <M-right> <M-right> 
<M-right> <M-right> <M-right> <M-right> <M-right> <M-right> 
<M-right> <M-right> <M-right> <M-right> <M-right> <M-left> 
<M-left> <M-left> <M-left> <M-left> <M-left> <M-left> 
<M-left> <M-left> <M-left> <M-left> <M-left> <M-left> 
<M-left> <M-left> <M-left> <M-left> <M-left> <M-left> 
<M-left> <M-left> <M-left> <M-left> <M-left> <M-left> 
<M-left> <wheel-down> <double-wheel-down> <triple-wheel-down> 
<wheel-down> <double-wheel-down> <triple-wheel-down> 
<wheel-down> <double-wheel-down> <triple-wheel-down> 
<wheel-down> <double-wheel-down> <triple-wheel-down> 
<triple-wheel-down> <wheel-down> <double-wheel-down> 
<triple-wheel-down> <wheel-down> <double-wheel-down> 
<triple-wheel-down> <wheel-down> <double-wheel-down> 
<triple-wheel-down> <wheel-up> <double-wheel-up> <triple-wheel-up> 
<wheel-up> <wheel-up> <double-wheel-up> <triple-wheel-up> 
<help-echo> <down-mouse-1> <mouse-1> <wheel-up> <double-wheel-up> 
<triple-wheel-up> <triple-wheel-up> <wheel-up> <double-wheel-up> 
<triple-wheel-up> <down> <down> <down> <down> <down> 
<up> <up> <up> <up> <up> <s-up> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <s-right> <left> <left> 
<left> <left> <left> <left> <left> <left> <left> s-N 
s-w k <left> <left> <left> <left> <left> <left> <left> 
<left> <left> s-N s-w k <escape> x e m a c s - b u 
g <return> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
r e p o r t - e m a c s - b u g <return>

Recent messages:
Mark set
[k]ill or [s]ave draft?
Loading msgdb for 
Type C-c C-x C-z to exit MIME mode, and type C-c C-x ? to get help.
Mark set
[k]ill or [s]ave draft?
Loading msgdb for 

Load-path shadows:
/Users/HOME/.0.data/.0.emacs/.0.flim/md4 hides 
/Users/HOME/.0.data/.0.emacs/.0.flim/hex-util hides 
/Users/HOME/.0.data/.0.emacs/.0.flim/sasl hides 
/Users/HOME/.0.data/.0.emacs/.0.flim/sasl-ntlm hides 
/Users/HOME/.0.data/.0.emacs/.0.flim/sasl-digest hides 
/Users/HOME/.0.data/.0.emacs/.0.flim/sasl-cram hides 
/Users/HOME/.0.data/.0.emacs/.0.flim/ntlm hides 
/Users/HOME/.0.data/.0.emacs/.0.flim/hmac-md5 hides 
/Users/HOME/.0.data/.0.emacs/.0.flim/hmac-def hides 
/Users/HOME/.0.data/.0.emacs/.0.wl/rfc2368 hides 
/Users/HOME/.0.data/.0.emacs/.0.wl/utf7 hides 
/Users/HOME/.0.data/.0.emacs/.0.simi/smime hides 
/Users/HOME/.emacs.d/elpa/tabulated-list-20120406.1351/tabulated-list hides 
/Users/HOME/.0.data/.0.emacs/.0.simi/pgg hides 
/Users/HOME/.0.data/.0.emacs/.0.simi/pgg-pgp5 hides 
/Users/HOME/.0.data/.0.emacs/.0.simi/pgg-pgp hides 
/Users/HOME/.0.data/.0.emacs/.0.simi/pgg-parse hides 
/Users/HOME/.0.data/.0.emacs/.0.simi/pgg-gpg hides 
/Users/HOME/.0.data/.0.emacs/.0.simi/pgg-def hides 

(shadow emacsbug modb-legacy wl-mime mime-edit pgg-parse pccl pccl-20
signature mime-setup mail-mime-setup semi-setup mime-pgp pgg-def
mime-play filename mime-image modb-standard elmo-imap4 disp-table
bbdb-autoloads lawlist-wl wl-demo wl-draft eword-encode wl-template
sendmail elmo-net elmo-cache elmo-map elmo-dop wl-news wl-address
wl-thread wl-folder wl wl-e21 wl-spam wl-action wl-summary wl-refile
wl-util pp elmo-flag elmo-localdir wl-message elmo-mime mmelmo-buffer
mmelmo-imap mime-view mime-conf calist semi-def mmimap mime-parse
mmbuffer mmgeneric elmo-multi elmo-spam elsp-header elsp-generic elmo
elmo-signal wl-highlight wl-vars wl-version elmo-msgdb modb
modb-generic modb-entity luna mime elmo-util emu invisible inv-23 poem
poem-e20 poem-e20_3 eword-decode std11 elmo-date elmo-vars
elmo-version w3m-load mime-w3m w3m browse-url doc-view jka-compr
image-mode w3m-hist w3m-fb bookmark-w3m w3m-ems w3m-ccl ccl
w3m-favicon w3m-image w3m-proc w3m-util smiley gnus-art mm-uu mml2015
mm-view mml-smime smime savehist lawlist-vr-hr lawlist-whitespace
lawlist-github conf-mode log-edit add-log find-lisp package esh-var
esh-io esh-cmd esh-opt esh-ext esh-proc esh-arg eldoc esh-groups
eshell esh-module esh-mode esh-util dired-x view tramp tramp-compat
tramp-loaddefs trampver server grep epa epg epg-config diff-mode
autorevert filenotify log-view pcvs-util ido time-stamp vc-git vc
vc-dispatcher ediff-merg ediff-wind ediff-diff ediff-mult ediff-help
ediff-init ediff-util ediff rx ert ewoc debug eieio-base
lawlist-calculator ps-print ps-def lpr flyspell ispell bbdb timezone
find-func dired-aux lawlist-yasnippet help-mode multiple-cursors
mc-separate-operations rectangular-region-mode mc-mark-more thingatpt
mc-cycle-cursors mc-edit-lines multiple-cursors-core rect saveplace
lawlist-tex-mode pcase compile shell pcomplete comint ansi-color ring
skeleton compare-w desktop frameset lawlist-tabbar lawlist-org
lawlist-calendar edmacro kmacro derived lawlist-toodledo advice
url-http url-auth url-gw url url-proxy url-privacy url-expand
url-methods url-history url-cookie url-domsuf url-util url-parse
auth-source eieio byte-opt bytecomp byte-compile cconv eieio-core
password-cache url-vars mailcap json xml noutline outline easy-mmode
gnus-sum gnus-group gnus-undo gnus-start gnus-cloud nnimap nnmail
mail-source tls utf7 mel path-util mime-def alist mcharset mcs-20
mcs-e20 pcustom pces pces-e20 pces-20 broken poe pym static apel-ver
product netrc nnoo parse-time gnus-spec gnus-int gnus-range message
cl-macs dired format-spec rfc822 mml easymenu mml-sec mm-decode
mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045 ietf-drums
mailabbrev gmm-utils mailheader gnus-win gnus gnus-ems nnheader
gnus-util mail-utils mm-util help-fns mail-prsvr wid-edit cl gv
cl-loaddefs cl-lib time-date tooltip electric uniquify ediff-hook
vc-hooks lisp-float-type mwheel ns-win 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
cocoa ns multi-tty emacs)

Memory information:
((conses 16 736782 78749)
 (symbols 48 55597 0)
 (miscs 40 501 2390)
 (strings 32 116279 16804)
 (string-bytes 1 3864862)
 (vectors 16 42181)
 (vector-slots 8 741196 80204)
 (floats 8 1011 262)
 (intervals 56 778 234)
 (buffers 960 13))

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