GNU bug report logs - #34957
26.1; Minibuffer sometimes shrinks unexpectedly

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Package: emacs; Reported by: Markus Triska <triska@HIDDEN>; Keywords: confirmed; dated Sat, 23 Mar 2019 18:02:01 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
Added tag(s) confirmed. Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at 34957 <at> debbugs.gnu.org:


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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Markus Triska <triska@HIDDEN>
Subject: Re: bug#34957: 26.1; Minibuffer sometimes shrinks unexpectedly
References: <m2sgvdmpw3.fsf@HIDDEN>
Date: Tue, 09 Jul 2019 18:13:52 +0200
In-Reply-To: <m2sgvdmpw3.fsf@HIDDEN> (Markus Triska's message of "Sat,
 23 Mar 2019 19:01:16 +0100")
Message-ID: <87v9wbrxrz.fsf@HIDDEN>
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 Content preview:  Markus Triska <triska@HIDDEN> writes: > Please start
 Emacs with "emacs -Q", and then evaluate the form: > > (with-selected-window
 (minibuffer-window) > (erase-buffer) > (insert (propertize "hello" 'face
 '(:height 3.0))) > (read-key) > (re [...] 
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Markus Triska <triska@HIDDEN> writes:

> Please start Emacs with "emacs -Q", and then evaluate the form:
>
>     (with-selected-window (minibuffer-window)
>       (erase-buffer)
>       (insert (propertize "hello" 'face '(:height 3.0)))
>       (read-key)
>       (read-key)
>       (insert (propertize " there!" 'face '(:height 3.0)))
>       (read-key)
>       (erase-buffer))
>
> What I observe is:
>
>     1) "hello" is displayed in the minibuffer, and the minibuffer
>        grows so that the text is entirely visible
>     2) when I then press a key, the minibuffer unexpectedly shrinks,
>        and the same text is now no longer fully visible
>     3) when I then press another key, " there!" is added,
>        and the minibuffer is grown again

I can confirm that this bug is still present in Emacs 27.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#34957; Package emacs. Full text available.

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From: Markus Triska <triska@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 26.1; Minibuffer sometimes shrinks unexpectedly
Date: Sat, 23 Mar 2019 19:01:16 +0100
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Please start Emacs with "emacs -Q", and then evaluate the form:

    (with-selected-window (minibuffer-window)
      (erase-buffer)
      (insert (propertize "hello" 'face '(:height 3.0)))
      (read-key)
      (read-key)
      (insert (propertize " there!" 'face '(:height 3.0)))
      (read-key)
      (erase-buffer))

What I observe is:

    1) "hello" is displayed in the minibuffer, and the minibuffer
       grows so that the text is entirely visible
    2) when I then press a key, the minibuffer unexpectedly shrinks,
       and the same text is now no longer fully visible
    3) when I then press another key, " there!" is added,
       and the minibuffer is grown again

What I expect is that throughout the whole interaction, the minibuffer
consistently stay at the required size to show the entire text.

In addition, when I remove the first or second read-key call above,
i.e., when I instead evaluate the form:

    (with-selected-window (minibuffer-window)
      (erase-buffer)
      (insert (propertize "hello" 'face '(:height 3.0)))
      (read-key)
      (insert (propertize " there!" 'face '(:height 3.0)))
      (read-key)
      (erase-buffer))

then the minibuffer indeed does stay at the expected size throughout.
Hence, the size of the minibuffer unexpectedly depends on whether
read-key is invoked once or twice.

Thank you and all the best,
Markus


In GNU Emacs 26.1 (build 1, x86_64-apple-darwin15.3.0, X toolkit, Xaw scroll bars)
 of 2018-09-22 built on mt-computer
Windowing system distributor 'The X.Org Foundation', version 11.0.11502000

Configured features:
XPM JPEG TIFF GIF PNG GSETTINGS NOTIFY ACL GNUTLS LIBXML2 FREETYPE XFT
ZLIB TOOLKIT_SCROLL_BARS LUCID X11 MODULES THREADS LCMS2
Acknowledgement sent to Markus Triska <triska@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#34957; Package emacs. Full text available.
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Last modified: Mon, 25 Nov 2019 12:00:02 UTC

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