GNU logs - #39379, boring messages

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Subject: bug#39379: 27.0.60; Fix for #38457 broke ido-vertical-mode
Resent-From: Jimmy Yuen Ho Wong <wyuenho@HIDDEN>
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To: 39379 <at> debbugs.gnu.org
From: Jimmy Yuen Ho Wong <wyuenho@HIDDEN>
Date: Fri, 31 Jan 2020 23:53:19 +0000
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Fix for #38457, commit 3b0938c0420de2b845e7e8f8fbbb57ddc61718f2, seems
to have broken ido-vertical-mode and perhaps other minor modes that uses
similar techniques to render a custom ido completion list. Is there
another fix possible, or better yet, introduce a new overridable
function that controls how the prompt is displayed?

https://github.com/creichert/ido-vertical-mode.el/issues/48


In GNU Emacs 27.0.60 (build 1, x86_64-apple-darwin18.7.0, NS appkit-1671.60=
 Version 10.14.6 (Build 18G2022))
 of 2020-01-31 built on MobileCat.local
Repository revision: cdf8c31844263312aaf08527ce251edb32c5819c
Repository branch: HEAD
Windowing system distributor 'Apple', version 10.3.1671
System Description:  Mac OS X 10.14.6

Recent messages:
Can=E2=80=99t guess python-indent-offset, using defaults: 4
Importmagic and/or epc not found. importmagic.el will not be working.
Can=E2=80=99t guess python-indent-offset, using defaults: 4
Importmagic and/or epc not found. importmagic.el will not be working. [6 ti=
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ls does not support --dired; see =E2=80=98dired-use-ls-dired=E2=80=99 for m=
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Wrote /Users/wyuenho/.emacs.d/.emacs.desktop.lock
Desktop: 1 frame, 24 buffers restored.
Turning on magit-auto-revert-mode...done (1.118s, 74 buffers checked)
For information about GNU Emacs and the GNU system, type C-h C-a.
Package cl is deprecated

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X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Jimmy Yuen Ho Wong <wyuenho@HIDDEN>
Subject: bug#39379: Acknowledgement (27.0.60; Fix for #38457 broke
 ido-vertical-mode)
Message-ID: <handler.39379.B.15805148104063.ack <at> debbugs.gnu.org>
References: <m2a763uqs0.fsf@HIDDEN>
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Reply-To: 39379 <at> debbugs.gnu.org
Date: Fri, 31 Jan 2020 23:54:02 +0000

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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#39379: 27.0.60; Fix for #38457 broke ido-vertical-mode
Resent-From: Eli Zaretskii <eliz@HIDDEN>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
Resent-CC: bug-gnu-emacs@HIDDEN
Resent-Date: Sat, 01 Feb 2020 08:13:02 +0000
Resent-Message-ID: <handler.39379.B39379.158054476918636 <at> debbugs.gnu.org>
Resent-Sender: help-debbugs@HIDDEN
To: Jimmy Yuen Ho Wong <wyuenho@HIDDEN>
Cc: 39379 <at> debbugs.gnu.org
Date: Sat, 01 Feb 2020 10:12:25 +0200
Message-Id: <83a762k9p2.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
In-reply-to: <m2a763uqs0.fsf@HIDDEN> (message from Jimmy Yuen Ho Wong on
 Fri, 31 Jan 2020 23:53:19 +0000)
References: <m2a763uqs0.fsf@HIDDEN>
Precedence: list
Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org
Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>

> From: Jimmy Yuen Ho Wong <wyuenho@HIDDEN>
> Date: Fri, 31 Jan 2020 23:53:19 +0000
> 
> Fix for #38457, commit 3b0938c0420de2b845e7e8f8fbbb57ddc61718f2, seems
> to have broken ido-vertical-mode and perhaps other minor modes that uses
> similar techniques to render a custom ido completion list. Is there
> another fix possible, or better yet, introduce a new overridable
> function that controls how the prompt is displayed?
> 
> https://github.com/creichert/ido-vertical-mode.el/issues/48

Please show a recipe to reproduce the problem.  I don't use
ido-vertical-mode, and the issue you point to doesn't provide any
description of the actual problem, either.  So it's unclear what
exactly was broken by that commit and why.

Thanks.

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#39379: 27.0.60; Fix for #38457 broke ido-vertical-mode
Resent-From: Jimmy Yuen Ho Wong <wyuenho@HIDDEN>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
Resent-CC: bug-gnu-emacs@HIDDEN
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Cc: 39379 <at> debbugs.gnu.org
References: <m2a763uqs0.fsf@HIDDEN> <83a762k9p2.fsf@HIDDEN>
From: Jimmy Yuen Ho Wong <wyuenho@HIDDEN>
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On 01/02/2020 08:12, Eli Zaretskii wrote:
>> From: Jimmy Yuen Ho Wong <wyuenho@HIDDEN>
>> Date: Fri, 31 Jan 2020 23:53:19 +0000
>>
>> Fix for #38457, commit 3b0938c0420de2b845e7e8f8fbbb57ddc61718f2, seems
>> to have broken ido-vertical-mode and perhaps other minor modes that uses
>> similar techniques to render a custom ido completion list. Is there
>> another fix possible, or better yet, introduce a new overridable
>> function that controls how the prompt is displayed?
>>
>> https://github.com/creichert/ido-vertical-mode.el/issues/48
> Please show a recipe to reproduce the problem.  I don't use
> ido-vertical-mode, and the issue you point to doesn't provide any
> description of the actual problem, either.  So it's unclear what
> exactly was broken by that commit and why.
>
> Thanks.

Steps for reproduction:

1. $ echo "(ido-mode)(require 'ido-vertical-mode)(ido-vertical-mode)" >
.emacs

2. $ emacs

3. C-x C-f

4. The Find file prompt is missing since that commit.

I've also attached screenshots here.

https://github.com/creichert/ido-vertical-mode.el/issues/48#issuecomment-581033055

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> Cc: 39379 <at> debbugs.gnu.org
> From: Jimmy Yuen Ho Wong <wyuenho@HIDDEN>
> Date: Sun, 2 Feb 2020 13:58:36 +0000
> 
> 1. $ echo "(ido-mode)(require 'ido-vertical-mode)(ido-vertical-mode)" >
> .emacs
> 
> 2. $ emacs
> 
> 3. C-x C-f
> 
> 4. The Find file prompt is missing since that commit.

I see, thanks.

However, I'm not sure your proposal is the optimal solution: what will
happen if ido-exhibit uses the old code, and a message is displayed
while the user goes through the completion candidates?  The trick with
the overlay was to make sure the message is displayed without
overwriting the minibuffer prompt.

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> Date: Sun, 02 Feb 2020 18:13:47 +0200
> From: Eli Zaretskii <eliz@HIDDEN>
> Cc: 39379 <at> debbugs.gnu.org
> 
> > 1. $ echo "(ido-mode)(require 'ido-vertical-mode)(ido-vertical-mode)" >
> > .emacs
> > 
> > 2. $ emacs
> > 
> > 3. C-x C-f
> > 
> > 4. The Find file prompt is missing since that commit.
> 
> I see, thanks.
> 
> However, I'm not sure your proposal is the optimal solution: what will
> happen if ido-exhibit uses the old code, and a message is displayed
> while the user goes through the completion candidates?  The trick with
> the overlay was to make sure the message is displayed without
> overwriting the minibuffer prompt.

I think this could be a bug in the display engine, related to resizing
the mini-window when an after-string that includes many newlines is
put at EOB.  Let me look into it.

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> Date: Sun, 02 Feb 2020 19:23:46 +0200
> From: Eli Zaretskii <eliz@HIDDEN>
> Cc: 39379 <at> debbugs.gnu.org, dgutov@HIDDEN
> 
> I think this could be a bug in the display engine, related to resizing
> the mini-window when an after-string that includes many newlines is
> put at EOB.  Let me look into it.

Looks like my guess was correct.  I'll try to devise a solution.

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> Date: Sun, 02 Feb 2020 20:06:16 +0200
> From: Eli Zaretskii <eliz@HIDDEN>
> Cc: 39379 <at> debbugs.gnu.org, dgutov@HIDDEN
> 
> > I think this could be a bug in the display engine, related to resizing
> > the mini-window when an after-string that includes many newlines is
> > put at EOB.  Let me look into it.
> 
> Looks like my guess was correct.  I'll try to devise a solution.

Workaround: set ido-max-prospects to 7 or less.

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On 02/02/2020 18:38, Eli Zaretskii wrote:
> Workaround: set ido-max-prospects to 7 or less.

That gets the prompt back but now the cursor is at the wrong place lol

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> Cc: 39379 <at> debbugs.gnu.org, dgutov@HIDDEN
> From: Jimmy Yuen Ho Wong <wyuenho@HIDDEN>
> Date: Sun, 2 Feb 2020 21:33:22 +0000
> 
> On 02/02/2020 18:38, Eli Zaretskii wrote:
> > Workaround: set ido-max-prospects to 7 or less.
> 
> That gets the prompt back but now the cursor is at the wrong place lol

That's a separate problem that should be easy to fix.  The problem is
that the new code in ido.el tells Emacs to display the cursor on the
first character of the overlay string, but that first character is a
newline in the case of ido-vertical-mode, and Emacs cannot place the
cursor on a newline.

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 Content preview:  On 03.02.2020 0:33, Jimmy Yuen Ho Wong wrote: > That gets
 the prompt back but now the cursor is at the wrong place lol I've suggested
 a workaround for that in the GitHub issue commends as soon as you opened
 this bug report (2 days ago). 
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On 03.02.2020 0:33, Jimmy Yuen Ho Wong wrote:
> That gets the prompt back but now the cursor is at the wrong place lol

I've suggested a workaround for that in the GitHub issue commends as 
soon as you opened this bug report (2 days ago).

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> Cc: 39379 <at> debbugs.gnu.org
> From: Dmitry Gutov <dgutov@HIDDEN>
> Date: Mon, 3 Feb 2020 16:19:12 +0300
> 
> On 03.02.2020 0:33, Jimmy Yuen Ho Wong wrote:
> > That gets the prompt back but now the cursor is at the wrong place lol
> 
> I've suggested a workaround for that in the GitHub issue commends as 
> soon as you opened this bug report (2 days ago).

That's exactly the solution I had in mind.  I suggest that you push it
to the Emacs Git repository without waiting for the solution of the
larger issue (which will take me some time to design and test).

Btw, the reason you didn't see the problem is that the list of
candidates in your case was very small.  That's what the workaround
with ido-max-prospects <= 7 does when the list is longer.

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 Content preview:  On 03.02.2020 18:40, Eli Zaretskii wrote: >> I've suggested
 a workaround for that in the GitHub issue commends as >> soon as you opened
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On 03.02.2020 18:40, Eli Zaretskii wrote:

>> I've suggested a workaround for that in the GitHub issue commends as
>> soon as you opened this bug report (2 days ago).
> 
> That's exactly the solution I had in mind.  I suggest that you push it
> to the Emacs Git repository without waiting for the solution of the
> larger issue (which will take me some time to design and test).

Not for us to do, it's a change to be done in ido-vertical-mode, not in 
ido.el (they override a built-in function).

> Btw, the reason you didn't see the problem is that the list of
> candidates in your case was very small.  That's what the workaround
> with ido-max-prospects <= 7 does when the list is longer.

Yes, I saw that later. :-(

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> Cc: 39379 <at> debbugs.gnu.org, wyuenho@HIDDEN
> From: Dmitry Gutov <dgutov@HIDDEN>
> Date: Tue, 4 Feb 2020 00:51:49 +0300
> 
> On 03.02.2020 18:40, Eli Zaretskii wrote:
> 
> >> I've suggested a workaround for that in the GitHub issue commends as
> >> soon as you opened this bug report (2 days ago).
> > 
> > That's exactly the solution I had in mind.  I suggest that you push it
> > to the Emacs Git repository without waiting for the solution of the
> > larger issue (which will take me some time to design and test).
> 
> Not for us to do, it's a change to be done in ido-vertical-mode, not in 
> ido.el (they override a built-in function).

I think this is for ido.el to do: it is ido.el that puts the cursor on
the overlay string, so it is up to it to make sure the cursor can be
put where it puts the 'cursor' property.  It's a simple change: if the
text to be displayed starts with a newline, prepend a SPC to it when
defining the after-string.

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 Content preview:  On 04.02.2020 6:27, Eli Zaretskii wrote: > I think this is
 for ido.el to do: it is ido.el that puts the cursor on > the overlay string,
 so it is up to it to make sure the cursor can be > put where it puts the
 'cursor' property. It's a simple [...] 
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On 04.02.2020 6:27, Eli Zaretskii wrote:

> I think this is for ido.el to do: it is ido.el that puts the cursor on
> the overlay string, so it is up to it to make sure the cursor can be
> put where it puts the 'cursor' property.  It's a simple change: if the
> text to be displayed starts with a newline, prepend a SPC to it when
> defining the after-string.

But... the change in ido-vertical-mode is simpler still: just add an 
extra argument to concat.

If we do that in ido.do, the reason why would be fairly non-obvious from 
that code. After all, we don't provide any customization points in 
there, hooks or otherwise. So we risk accidentally losing that change in 
some future version.

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> Cc: 39379 <at> debbugs.gnu.org, wyuenho@HIDDEN
> From: Dmitry Gutov <dgutov@HIDDEN>
> Date: Tue, 4 Feb 2020 16:19:05 +0300
> 
> On 04.02.2020 6:27, Eli Zaretskii wrote:
> 
> > I think this is for ido.el to do: it is ido.el that puts the cursor on
> > the overlay string, so it is up to it to make sure the cursor can be
> > put where it puts the 'cursor' property.  It's a simple change: if the
> > text to be displayed starts with a newline, prepend a SPC to it when
> > defining the after-string.
> 
> But... the change in ido-vertical-mode is simpler still: just add an 
> extra argument to concat.

That's true, but AFAIU the problem is not limited to
ido-vertical-mode, it will happen whenever the string to display
starts with a newline.  Such a string is entirely legitimate, isn't
it?  And the caller cannot possibly know that ido-exhibit will put the
'cursor' property on the first character of that text.  So I think it
isn't entirely reasonable to expect such callers to defend themselves
against internal implementation details of ido-exhibit.

> If we do that in ido.do, the reason why would be fairly non-obvious from 
> that code.

If the test for the leading newline is there, the reason is quite
obvious, and we can have a comment for those who don't know enough
about the 'cursor' property and cursor positioning.  I think the
result will more obvious than a mysterious concatenation of a blank in
ido-vertical-mode, which will need a comment explaining it as well.

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 Content preview:  On 04.02.2020 18:40,
 Eli Zaretskii wrote: >> But... the change
 in ido-vertical-mode is simpler still: just add an >> extra argument to
 concat.
 > > That's true, but AFAIU the problem is not limited to > ido-vertical-mode, 
 it will happen whenev [...] 
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On 04.02.2020 18:40, Eli Zaretskii wrote:

>> But... the change in ido-vertical-mode is simpler still: just add an
>> extra argument to concat.
> 
> That's true, but AFAIU the problem is not limited to
> ido-vertical-mode, it will happen whenever the string to display
> starts with a newline.  Such a string is entirely legitimate, isn't
> it? And the caller cannot possibly know that ido-exhibit will put the
> 'cursor' property on the first character of that text.  So I think it
> isn't entirely reasonable to expect such callers to defend themselves
> against internal implementation details of ido-exhibit.

Umm, it's ido-exhibit that calls ido-completions. And ido-completions, 
as defined in ido.el, never returns such strings.

Anyway, since you insist, I've pushed that change.

>> If we do that in ido.do, the reason why would be fairly non-obvious from
>> that code.
> 
> If the test for the leading newline is there, the reason is quite
> obvious, and we can have a comment for those who don't know enough
> about the 'cursor' property and cursor positioning.  I think the
> result will more obvious than a mysterious concatenation of a blank in
> ido-vertical-mode, which will need a comment explaining it as well.

Yes, ok. Although our general policy, I think, is that external packages 
that use questionable practices (such as redefining functions, instead 
of using whatever available public customization points there are) are 
generally left to their own devices.

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From: Eli Zaretskii <eliz@HIDDEN>
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> Cc: 39379 <at> debbugs.gnu.org, wyuenho@HIDDEN
> From: Dmitry Gutov <dgutov@HIDDEN>
> Date: Wed, 5 Feb 2020 02:55:00 +0300
> 
> Anyway, since you insist, I've pushed that change.

Thanks.

> > If the test for the leading newline is there, the reason is quite
> > obvious, and we can have a comment for those who don't know enough
> > about the 'cursor' property and cursor positioning.  I think the
> > result will more obvious than a mysterious concatenation of a blank in
> > ido-vertical-mode, which will need a comment explaining it as well.
> 
> Yes, ok. Although our general policy, I think, is that external packages 
> that use questionable practices (such as redefining functions, instead 
> of using whatever available public customization points there are) are 
> generally left to their own devices.

True.  But I think this case is somewhat special, as ido-exhibit
handles the completion list in a way that cannot be easily guessed in
advance.

Message sent to bug-gnu-emacs@HIDDEN:

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Subject: bug#39379: 27.0.60; Fix for #38457 broke ido-vertical-mode
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From: Eli Zaretskii <eliz@HIDDEN>
In-reply-to: <83a760j23r.fsf@HIDDEN> (message from Eli Zaretskii on Sun, 02
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> Date: Sun, 02 Feb 2020 20:06:16 +0200
> From: Eli Zaretskii <eliz@HIDDEN>
> Cc: 39379 <at> debbugs.gnu.org, dgutov@HIDDEN
> 
> > Date: Sun, 02 Feb 2020 19:23:46 +0200
> > From: Eli Zaretskii <eliz@HIDDEN>
> > Cc: 39379 <at> debbugs.gnu.org, dgutov@HIDDEN
> > 
> > I think this could be a bug in the display engine, related to resizing
> > the mini-window when an after-string that includes many newlines is
> > put at EOB.  Let me look into it.
> 
> Looks like my guess was correct.  I'll try to devise a solution.

Sorry for a relatively long delay.  In my defense, I first tried a
couple of easy solutions, but they didn't work.  And that got me
thinking, since my experience with solving issues like this due to
overlay strings is that the solutions tend to be less than elegant,
and take several attempts to get them right.

So now, after thinking about this for some time, I think I want to
change my mind and ask why do we need to use an overlay with
after-string in ido.el?  Re-reading related discussions, it seems the
answer is "so that the temporary display of messages is not at the end
of the minibuffer, where it could be invisible due to
resize-mini-windows being nil or restrictions imposed by ido.el via
ido-max-window-height".  Is that the correct conclusion?  If so, then
I think we can solve that problem without overlays.  See the proposed
patch below, which basically reverts ido.el to its previous shape, and
uses a special text property to instruct set-minibuffer-message where
to put the overlay (defaulting to EOB).

WDYT?

diff --git a/lisp/ido.el b/lisp/ido.el
index 6707d81407..edc848f52f 100644
--- a/lisp/ido.el
+++ b/lisp/ido.el
@@ -4728,16 +4728,10 @@ ido-exhibit
 	(let ((inf (ido-completions contents)))
 	  (setq ido-show-confirm-message nil)
 	  (ido-trace "inf" inf)
-          (when ido--overlay
-            (delete-overlay ido--overlay))
-          (let ((o (make-overlay (point-max) (point-max) nil t t)))
-            (when (> (length inf) 0)
-              ;; For hacks that redefine ido-completions function (bug#39379)
-              (when (eq (aref inf 0) ?\n)
-                (setq inf (concat " " inf)))
-              (put-text-property 0 1 'cursor t inf))
-            (overlay-put o 'after-string inf)
-            (setq ido--overlay o)))
+          (let ((pos (point)))
+            (insert inf)
+            (put-text-property pos (1+ pos) 'minibuffer-message t))
+          )
 	))))
 
 (defun ido-completions (name)
diff --git a/lisp/minibuffer.el b/lisp/minibuffer.el
index 0589211877..767fc8dff8 100644
--- a/lisp/minibuffer.el
+++ b/lisp/minibuffer.el
@@ -763,6 +763,16 @@ minibuffer-message-clear-timeout
 (defvar minibuffer-message-timer nil)
 (defvar minibuffer-message-overlay nil)
 
+(defun minibuffer--message-overlay-pos ()
+  "Return position where `set-minibuffer-message' shall put message overlay."
+  ;; Starting from point, look for non-nil 'minibuffer-message'
+  ;; property, and return its position.  If none found, return the EOB
+  ;; position.
+  (let* ((pt (point))
+         (propval (get-text-property pt 'minibuffer-message)))
+    (if propval pt
+      (next-single-property-change pt 'minibuffer-message nil (point-max)))))
+
 (defun set-minibuffer-message (message)
   "Temporarily display MESSAGE at the end of the minibuffer.
 The text is displayed for `minibuffer-message-clear-timeout' seconds
@@ -784,8 +794,9 @@ set-minibuffer-message
 
       (clear-minibuffer-message)
 
-      (setq minibuffer-message-overlay
-            (make-overlay (point-max) (point-max) nil t t))
+      (let ((ovpos (minibuffer--message-overlay-pos)))
+        (setq minibuffer-message-overlay
+              (make-overlay ovpos ovpos nil t t)))
       (unless (zerop (length message))
         ;; The current C cursor code doesn't know to use the overlay's
         ;; marker's stickiness to figure out whether to place the cursor

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To: control <at> debbugs.gnu.org
In-reply-to: <69eaf2ed-08d1-acc1-2251-794dc46b704b@HIDDEN> (message from
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Subject: Re: bug#39433: Small values of ido-max-window-height hide the prompt
 when there are enough completions
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forcemerge 39433 39379
thanks

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