bug#27807: 25.2; ido-completing-read handles cons-style initial-input wrong

[Ryan]

When executing:

(completing-read-default "Pick: " '("aaa" "aab" "aac") nil t '("aa" . 1))

the point is placed initially between the two a's as expected. If
"completing-read-default" is replaced with "ido-completing-read", the
point is instead placed one character to the left of where it should be
(in this case, at the start of the input). The reason is revealed in a
comments in "completing-read-default":

> `completing-read' uses 0-based index while `read-from-minibuffer' uses
> 1-based index.

Looking at "ido-read-internal", it passes the inital-input argument
directly to "read-from-minibuffer" without incrementing it as
"completing-read-default" does. Therefore any initial input of the form
"(STRING . POSITION)" is handled incorrectly by ido, but this can be
fixed by copying over the logic from "completing-read-default", as in
this patch:
https://mneme.dedyn.io/zerobin/?7cd07d73217c68e5#Aynth3YcZDcE7bkq8cxQnBl+uJ0/+d0UGYmB+7PqLT4=



In GNU Emacs 25.2.1 (x86_64-apple-darwin13.4.0, NS appkit-1265.21 
Version 10.9.5 (Build 13F1911))
of 2017-04-21 built on builder10-9.porkrind.org
Windowing system distributor 'Apple', version 10.3.1404
Configured using:
'configure --with-ns '--enable-locallisppath=/Library/Application
Support/Emacs/${version}/site-lisp:/Library/Application
Support/Emacs/site-lisp' --with-modules'

Configured features:
NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS MODULES

Important settings:
value of $LANG: en_US.UTF-8
locale-coding-system: utf-8-unix

Major mode: Emacs-Lisp

Minor modes in effect:
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cc-styles cc-align cc-engine cc-vars cc-defs yaml-mode jka-compr vc-git
flymake emacsbug sendmail face-remap ws-butler winner sml-modeline
savehist saveplace minibuf-eldef mb-depth midnight ido-yes-or-no
icomplete highlight-stages undo-tree diff pointback assoc hl-line anzu
desktop frameset delsel beacon auto-dim-other-buffers
ido-completing-read+ loadhist bar-cursor debian-changelog-mode
git-wip-mode vc vc-dispatcher ido-complete-space-or-hyphen tempbuf
smooth-scrolling .loaddefs cus-edit cus-start cus-load warnings
system-specific-settings snakemake-mode smex ido slime etags xref
project arc-mode archive-mode hyperspec python pretty-symbols polymode
poly-base polymode-weave polymode-export polymode-debug polymode-methods
poly-lock polymode-compat polymode-classes polymode-core eieio-custom
wid-edit eieio-base color osx-pseudo-daemon org-bullets
occur-context-resize noflet cl-indent markdown-mode thingatpt
magit-filenotify magit-obsolete magit-blame magit-stash magit-bisect
magit-remote magit-commit magit-sequence magit-notes magit-worktree
magit-branch magit-files magit-refs magit-status magit magit-repos
magit-apply magit-wip magit-log magit-diff smerge-mode diff-mode
magit-core magit-autorevert autorevert filenotify magit-process
magit-margin magit-mode magit-git magit-section magit-popup git-commit
magit-utils crm log-edit message rfc822 mml mml-sec epg mailabbrev
mail-utils gmm-utils mailheader pcvs-util add-log with-editor
async-bytecomp async tramp-sh server lexbind-mode highlight-defined
header2 git-gutter-fringe fringe-helper git-gutter esup esup-child
benchmark ess ess-mode ess-noweb-mode ess-inf ess-tracebug ess-generics
ess-utils ess-custom executable ess-compat el-get el-get-autoloading
el-get-list-packages el-get-dependencies el-get-build el-get-status pp
el-get-methods el-get-fossil el-get-svn el-get-pacman el-get-github-zip
el-get-github-tar el-get-http-zip el-get-http-tar el-get-hg el-get-go
el-get-git-svn el-get-fink el-get-emacswiki el-get-http el-get-notify
el-get-emacsmirror el-get-github el-get-git el-get-elpa el-get-darcs
el-get-cvs el-get-bzr el-get-brew el-get-builtin el-get-apt-get
el-get-recipes el-get-byte-compile subr-x el-get-custom el-get-core
autoload dired creole-mode keydef cperl-mode cl-lib-highlight bs
browse-url autopair paren auto-complete edmacro kmacro popup apache-mode
adjust-parens exec-path-from-shell use-package diminish bind-key compile
org-element avl-tree org org-macro org-footnote org-pcomplete org-list
org-faces org-entities noutline outline easy-mmode org-version
ob-emacs-lisp ob ob-tangle org-src ob-ref ob-lob ob-table ob-keys ob-exp
ob-comint tramp tramp-compat tramp-loaddefs trampver shell pcomplete
comint ansi-color ring ob-core ob-eval org-compat org-macs org-loaddefs
format-spec find-func cal-menu calendar cal-loaddefs pallet advice
gh-common gh-profile url-parse auth-source gnus-util password-cache
url-vars marshal eieio-compat ht eieio eieio-core cl slime-autoloads rx
info cask cl-seq cl-macs cask-bootstrap package-build mm-decode
mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045 ietf-drums
mm-util help-fns mail-prsvr json map lisp-mnt shut-up epl git commander
f dash s finder-inf package epg-config seq byte-opt gv bytecomp
byte-compile cl-extra help-mode easymenu cconv cl-loaddefs pcase cl-lib
time-date mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel ns-win ucs-normalize term/common-win tool-bar dnd
fontset image regexp-opt fringe tabulated-list newcomment elisp-mode
lisp-mode prog-mode register page menu-bar rfn-eshadow timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame
cl-generic cham georgian utf-8-lang misc-lang vietnamese tibetan thai
tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian
slovak czech european ethiopic indian cyrillic chinese charscript
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer
cl-preloaded 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 kqueue cocoa ns
multi-tty make-network-process emacs)

Memory information:
((conses 16 1589918 81512)
(symbols 48 62716 0)
(miscs 40 4243 4544)
(strings 32 688904 10332)
(string-bytes 1 7909896)
(vectors 16 95199)
(vector-slots 8 2220507 243585)
(floats 8 1043 1326)
(intervals 56 43474 1626)
(buffers 976 136))