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

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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auto-composition-mode: t
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auto-compression-mode: t
line-number-mode: t
transient-mark-mode: t

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

[Lars Ingebrigtsen]

Ryan <rct@thompsonclan.org> writes:

>> `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=

The link is dead now, but I think I've now fixed this for Emacs 27.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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

[Ryan C. Thompson]

On 7/15/19 11:54 AM, Lars Ingebrigtsen wrote:
> Ryan <rct@thompsonclan.org> writes:
>
>>> `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=
> The link is dead now, but I think I've now fixed this for Emacs 27.
>
So now I need to add a test on the version number in my 
ido-completing-read+ package to fix the index for older Emacsen while 
not fixing it for newer ones. Can you tell me which is the first version 
number this fix will be released in? 27.0? 27.1? Something else?

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

[Lars Ingebrigtsen]

"Ryan C. Thompson" <rct@thompsonclan.org> writes:

> So now I need to add a test on the version number in my
> ido-completing-read+ package to fix the index for older Emacsen while
> not fixing it for newer ones. Can you tell me which is the first
> version number this fix will be released in? 27.0? 27.1? Something
> else?

The released version this appears in will be 27.1.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no