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bug#34957: 26.1; Minibuffer sometimes shrinks unexpectedly

From: Lars Ingebrigtsen
Subject: bug#34957: 26.1; Minibuffer sometimes shrinks unexpectedly
Date: Tue, 09 Jul 2019 18:13:52 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

Markus Triska <address@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

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