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bug#17430: 24.4.50; minibuffer history forgets the first entry

From: Jarek Czekalski
Subject: bug#17430: 24.4.50; minibuffer history forgets the first entry
Date: Wed, 07 May 2014 13:07:31 +0200
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:24.0) Gecko/20100101 Thunderbird/24.3.0

1. (read-from-minibuffer "pro: " nil nil nil 'hist)
2. type sth
3. check hist: M-S-: hist

Expected: sth, Actual: nil

The history value is not properly initialized. Seems like r87775
introduced a regression, because histval is not set to nil in minibuf.c.

During some more tests I noticed another faulty behaviour. With empty history
(unbound) I get an error message "variable void", when trying to get this
history (arrow up in minibuffer). Let's move the initialization of the history
a bit earlier, to prevent this error and receive expected message "Beginning
of history". Previously this initialization was at "add new entry" stage, so
history browsing was failing.

Finally the patch contains a fix for the regression and additionally a further

Stefan, could you review the patch? If I am to commit this, to which
branch? emacs-24?

In GNU Emacs (i686-pc-mingw32)
 of 2014-05-07 on BONSOFTW7
Repository revision: 117068 address@hidden
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
 `configure --prefix=d:/program_files/emacs-master'

Configured features:

Important settings:
  value of $LANG: pl
  locale-coding-system: cp1250

Major mode: Text

Minor modes in effect:
  diff-auto-refine-mode: t
  global-hl-line-mode: t
  recentf-mode: t
  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
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<help-echo> C-x C-f j : / l a n g / g n u / e m <tab>
/ h i <tab> 1 <tab> <return> <next> <prior> C-x C-f
<up> <up> <up> <up> <down> <return> <C-end> <up> C-SPC
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up>
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up>
<up> <up> <down> M-w M-x r e p o r t <return>

Recent messages:
[yas] Loading compiled snippets from c:/Users/Jarek/AppData/Roaming/.emacs.d/snippets/sql-mode [yas] Loading compiled snippets from c:/Users/Jarek/AppData/Roaming/.emacs.d/snippets/text-mode Loading c:/Users/Jarek/AppData/Roaming/.emacs.d/snippets/text-mode/.yas-compiled-snippets.el (source)...done [yas] Loading snippet files from c:/Users/Jarek/AppData/Roaming/.emacs.d/snippets/text-mode
[yas] Loaded ~/.emacs.d/snippets
[yas] Reloaded everything....
Loading hl-line...done
Loading whitespace...done
Loading grep...done
For information about GNU Emacs and the GNU system, type C-h C-a.

Load-path shadows:
None found.

(shadow sort gnus-util mail-extr emacsbug message dired 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 mail-prsvr mail-utils diff-mode grep compile comint ansi-color
ring whitespace hl-line cus-start cus-load xml-parse yasnippet derived
easy-mmode edmacro kmacro help-mode folding-isearch folding cl-macs
advice help-fns cl gv bookmark pp recentf tree-widget wid-edit
cl-loaddefs cl-lib easymenu server time-date tooltip electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel dos-w32 ls-lisp
w32-common-fns disp-table w32-win w32-vars 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 w32notify w32
multi-tty emacs)

Memory information:
((conses 8 150932 5821)
 (symbols 24 22859 0)
 (miscs 20 102 150)
 (strings 16 24546 3867)
 (string-bytes 1 712166)
 (vectors 8 13203)
 (vector-slots 4 417745 4112)
 (floats 8 134 272)
 (intervals 28 363 32)
 (buffers 508 15))

Attachment: history_1_01.patch
Description: Text document

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