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Subject: bug#64139: 28.2; Scrolling problems in miniwindow
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I'm seeing some weird scrolling bugs in the miniwindow when the
minibuffer contains more lines than the window.  I think these
problems exist on ttys and graphical terminals of all sizes, but for
ease of reproducibility use an 80x24 tty.

   emacs-28.2 -Q -nw
   M-: C-@ C-x ( C-x C-k TAB C-q C-j C-u 9 9 C-x e C-x C-x C-v

The C-v, instead of scrolling a few lines, scrolls all the way down to
line 97.

Also, if you now repeatedly M-v, the buffer will just scroll up and
down three lines.  When I use a large X frame, repeated M-v will
scroll up to the top of the buffer, but then glitch and cycle around
back to the bottom.

--00000000000057be0305fe5c7805
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<div dir=3D"ltr">I&#39;m seeing some weird scrolling bugs in the miniwindow=
 when the<br>minibuffer contains more lines than the window.=C2=A0 I think =
these<br>problems exist on ttys and graphical terminals of all sizes, but f=
or<br>ease of reproducibility use an 80x24 tty.<br><br>=C2=A0 =C2=A0emacs-2=
8.2 -Q -nw<br>=C2=A0 =C2=A0M-: C-@ C-x ( C-x C-k TAB C-q C-j C-u 9 9 C-x e =
C-x C-x C-v<br><br>The C-v, instead of scrolling a few lines, scrolls all t=
he way down to<br>line 97.<br><br>Also, if you now repeatedly M-v, the buff=
er will just scroll up and<br>down three lines.=C2=A0 When I use a large X =
frame, repeated M-v will<br>scroll up to the top of the buffer, but then gl=
itch and cycle around<br>back to the bottom.<br></div>

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To: Al Petrofsky <al@HIDDEN>
Subject: bug#64139: Acknowledgement (28.2; Scrolling problems in miniwindow)
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Subject: bug#64139: 28.2; Scrolling problems in miniwindow
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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 (message from Al Petrofsky on Sat, 17 Jun 2023 20:26:19 -0400)
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> From: Al Petrofsky <al@HIDDEN>
> Date: Sat, 17 Jun 2023 20:26:19 -0400
> 
> I'm seeing some weird scrolling bugs in the miniwindow when the
> minibuffer contains more lines than the window.  I think these
> problems exist on ttys and graphical terminals of all sizes, but for
> ease of reproducibility use an 80x24 tty.
> 
>    emacs-28.2 -Q -nw
>    M-: C-@ C-x ( C-x C-k TAB C-q C-j C-u 9 9 C-x e C-x C-x C-v
> 
> The C-v, instead of scrolling a few lines, scrolls all the way down to
> line 97.

I tried to use this recipe, but it produces weird results, and I don't
see what you describe.  Would you like to show an easier to understand
recipe, or describe what should be in the min-window as result of the
recipe?  And what exactly are your expectations from C-v/M-v in this
case?

I tried this:

  M-x C-u 99 C-q C-j M-<

after that, C-v scrolls the mini-window as expected, so that I get to
the end in 13 C-v keypresses.  Which looks reasonable to me.

> Also, if you now repeatedly M-v, the buffer will just scroll up and
> down three lines.  When I use a large X frame, repeated M-v will
> scroll up to the top of the buffer, but then glitch and cycle around
> back to the bottom.

M-v in the minibuffer is bound to switch-to-completions, so I'm unsure
what you expected here.

Adding Juri who worked on the scrolling commands in the minibuffer.

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#64139: 28.2; Scrolling problems in miniwindow
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From: Al Petrofsky <al@HIDDEN>
Date: Sun, 18 Jun 2023 05:07:52 -0400
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--0000000000009270f205fe63c19a
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>
> > > I'm seeing some weird scrolling bugs in the miniwindow when the
> > > minibuffer contains more lines than the window.  I think these
> > > problems exist on ttys and graphical terminals of all sizes, but for
> > > ease of reproducibility use an 80x24 tty.
> > >
> > >    emacs-28.2 -Q -nw
> > >    M-: C-@ C-x ( C-x C-k TAB C-q C-j C-u 9 9 C-x e C-x C-x C-v
> > >
> > > The C-v, instead of scrolling a few lines, scrolls all the way down to
> > > line 97.
> >
> > I tried to use this recipe, but it produces weird results, and I don't
> > see what you describe.  Would you like to show an easier to understand
> > recipe, or describe what should be in the min-window as result of the
> > recipe?  And what exactly are your expectations from C-v/M-v in this
> > case?
>
> After the C-x e, the minibuffer contains 100 lines, each with a number
> "0" to "99".  After the C-x C-x, the miniwindow contents are, as
> expected, this:
>
>    Eval: 0
>    1
>    2
>    3
>    4
>
> After the C-v, I expect to see this:
>
>    3
>    4
>    5
>    6
>    7
>
> Instead I see this:
>
>    96
>    97 [cursor is at start of this line]
>    98
>    99
>    [empty line]
>
> > I tried this:
> >
> >   M-x C-u 99 C-q C-j M-<
> >
> > after that, C-v scrolls the mini-window as expected, so that I get to
> > the end in 13 C-v keypresses.  Which looks reasonable to me.
>
> I don't think 13 is right.  The miniwindow is only 5 lines (if tty is
> 80x24), so C-v should only be scrolling 3 lines at a time.
>
> Try this:
>
>    M-x C-@ C-u 9 9 C-q C-j C-x C-x C-v C-v C-v C-v
>
> I get "scroll-up-command: End of buffer" on only the fourth C-v.
>
> > > Also, if you now repeatedly M-v, the buffer will just scroll up and
> > > down three lines.  When I use a large X frame, repeated M-v will
> > > scroll up to the top of the buffer, but then glitch and cycle around
> > > back to the bottom.
>
> (By "scroll up" there I meant the window contents scroll down,
> i.e. the thing the PC keyboard key labeled "Page Up" does, which Emacs
> calls scroll-down.)
>
> > M-v in the minibuffer is bound to switch-to-completions, so I'm unsure
> > what you expected here.
>
> M-: doesn't do completion (although you can complete symbols within
> the expression with C-M-i), and leaves M-v bound to
> scroll-down-command.

--0000000000009270f205fe63c19a
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<div dir=3D"ltr"><div class=3D"gmail_quote"><blockquote class=3D"gmail_quot=
e" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204)=
;padding-left:1ex">&gt; &gt; I&#39;m seeing some weird scrolling bugs in th=
e miniwindow when the<br>&gt; &gt; minibuffer contains more lines than the =
window.=C2=A0 I think these<br>&gt; &gt; problems exist on ttys and graphic=
al terminals of all sizes, but for<br>&gt; &gt; ease of reproducibility use=
 an 80x24 tty.<br>&gt; &gt;<br>&gt; &gt; =C2=A0 =C2=A0emacs-28.2 -Q -nw<br>=
&gt; &gt; =C2=A0 =C2=A0M-: C-@ C-x ( C-x C-k TAB C-q C-j C-u 9 9 C-x e C-x =
C-x C-v<br>&gt; &gt;<br>&gt; &gt; The C-v, instead of scrolling a few lines=
, scrolls all the way down to<br>&gt; &gt; line 97.<br>&gt; <br>&gt; I trie=
d to use this recipe, but it produces weird results, and I don&#39;t<br>&gt=
; see what you describe.=C2=A0 Would you like to show an easier to understa=
nd<br>&gt; recipe, or describe what should be in the min-window as result o=
f the<br>&gt; recipe?=C2=A0 And what exactly are your expectations from C-v=
/M-v in this<br>&gt; case?<br><br>After the C-x e, the minibuffer contains =
100 lines, each with a number<br>&quot;0&quot; to &quot;99&quot;.=C2=A0 Aft=
er the C-x C-x, the miniwindow contents are, as<br>expected, this:<br><br>=
=C2=A0 =C2=A0Eval: 0<br>=C2=A0 =C2=A01<br>=C2=A0 =C2=A02<br>=C2=A0 =C2=A03<=
br>=C2=A0 =C2=A04<br><br>After the C-v, I expect to see this:<br><br>=C2=A0=
 =C2=A03<br>=C2=A0 =C2=A04<br>=C2=A0 =C2=A05<br>=C2=A0 =C2=A06<br>=C2=A0 =
=C2=A07<br><br>Instead I see this:<br><br>=C2=A0 =C2=A096<br>=C2=A0 =C2=A09=
7	[cursor is at start of this line]<br>=C2=A0 =C2=A098<br>=C2=A0 =C2=A099<b=
r>=C2=A0 =C2=A0[empty line]<br><br>&gt; I tried this:<br>&gt; <br>&gt; =C2=
=A0 M-x C-u 99 C-q C-j M-&lt;<br>&gt; <br>&gt; after that, C-v scrolls the =
mini-window as expected, so that I get to<br>&gt; the end in 13 C-v keypres=
ses.=C2=A0 Which looks reasonable to me.<br><br>I don&#39;t think 13 is rig=
ht.=C2=A0 The miniwindow is only 5 lines (if tty is<br>80x24), so C-v shoul=
d only be scrolling 3 lines at a time.<br><br>Try this:<br><br>=C2=A0 =C2=
=A0M-x C-@ C-u 9 9 C-q C-j C-x C-x C-v C-v C-v C-v<br><br>I get &quot;scrol=
l-up-command: End of buffer&quot; on only the fourth C-v.<br><br>&gt; &gt; =
Also, if you now repeatedly M-v, the buffer will just scroll up and<br>&gt;=
 &gt; down three lines.=C2=A0 When I use a large X frame, repeated M-v will=
<br>&gt; &gt; scroll up to the top of the buffer, but then glitch and cycle=
 around<br>&gt; &gt; back to the bottom.<br><br>(By &quot;scroll up&quot; t=
here I meant the window contents scroll down,<br>i.e. the thing the PC keyb=
oard key labeled &quot;Page Up&quot; does, which Emacs<br>calls scroll-down=
.)<br><br>&gt; M-v in the minibuffer is bound to switch-to-completions, so =
I&#39;m unsure<br>&gt; what you expected here.<br><br>M-: doesn&#39;t do co=
mpletion (although you can complete symbols within<br>the expression with C=
-M-i), and leaves M-v bound to<br>scroll-down-command.=C2=A0</blockquote></=
div></div>

--0000000000009270f205fe63c19a--

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> M-v in the minibuffer is bound to switch-to-completions, so I'm unsure
> what you expected here.
>
> Adding Juri who worked on the scrolling commands in the minibuffer.

I worked only on the <down> key bound to next-line-or-history-element.

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From: Al Petrofsky <al@HIDDEN>
Date: Mon, 19 Jun 2023 18:33:38 -0400
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--000000000000ebf16205fe832097
Content-Type: text/plain; charset="UTF-8"

Here's a simpler and clearer recipe that should show the problem on
any tty or X display:

   emacs-28.2 -Q
   M-: C-u 9 9 C-q C-j x C-@ M-< C-v

This creates a 100-line minibuffer with "x" on the last line.  After
the M-< and C-v, we should be one windowful down from the top, but
instead we've scrolled nearly to the end and the "x" has shown up on
the last line.

--000000000000ebf16205fe832097
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Here&#39;s a simpler and clearer recipe that should show t=
he problem on<br>any tty or X display:<br><br>=C2=A0 =C2=A0emacs-28.2 -Q<br=
>=C2=A0 =C2=A0M-: C-u 9 9 C-q C-j x C-@ M-&lt; C-v<br><br>This creates a 10=
0-line minibuffer with &quot;x&quot; on the last line.=C2=A0 After<br>the M=
-&lt; and C-v, we should be one windowful down from the top, but<br>instead=
 we&#39;ve scrolled nearly to the end and the &quot;x&quot; has shown up on=
<br>the last line.<br><br></div>

--000000000000ebf16205fe832097--

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> From: Al Petrofsky <al@HIDDEN>
> Date: Mon, 19 Jun 2023 18:33:38 -0400
> Cc: Juri Linkov <juri@HIDDEN>, 64139 <at> debbugs.gnu.org
> 
> Here's a simpler and clearer recipe that should show the problem on
> any tty or X display:
> 
>    emacs-28.2 -Q
>    M-: C-u 9 9 C-q C-j x C-@ M-< C-v
> 
> This creates a 100-line minibuffer with "x" on the last line.  After
> the M-< and C-v, we should be one windowful down from the top, but
> instead we've scrolled nearly to the end and the "x" has shown up on
> the last line.

Thanks.

This is a feature: scrolling (and redisplay in general) in the
mini-window is tailored to try and display the most important part of
the minibuffer text.  The feature is intended to support various
minibuffer-editing packages which display a lot of text in the
mini-window when the user is prompted for a file name or other similar
stuff, of which there are a lot of possible candidates.

If you set the variable redisplay-adhoc-scroll-in-resize-mini-windows
to a nil value, you will get the "normal" scrolling behavior in the
mini-window.

Last modified: Wed, 21 Jun 2023 15:15:02 UTC

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