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bug#25055: 25.1.50; completion buffer changes window size

From: martin rudalics
Subject: bug#25055: 25.1.50; completion buffer changes window size
Date: Sat, 15 Apr 2017 16:49:06 +0200

> 1. start emacs -Q
> 2. M-x shell
> 3. ls ./<tab><tab>
> 4. A temporary buffer pops up with all possible completions.
>     - if your home directory is big enough, this buffer will take up a
>     large portion of the frame
> 5. press <space>
> 6. The completions are dismissed, but the frame remains in its new
> configuration, with 90% of the space taken up by the window where the
> completions had been listed (this window has now returned to the
> shell-mode buffer).
> What I would expect to happen instead is that when the completions are
> dismissed, the window configuration returns to the state it was in
> before pressing tab: that is, the top half is the scratch buffer, the
> bottom half is the shell-mode buffer.

The bugs leading to this behavior should have been fixed now on master
with commit


Note that to get the desired behavior you have to (1) recompile
window.el and after that (2) recompile all users of the macro
`with-displayed-buffer-window' - that is, the files minibuffer.el and
dired.el and finally (3) rebuild Emacs.

If for some reason you cannot build Emacs or work with master, please
tell me.  I'll then try to explain how to get the desired behavior with
Emacs 25 and your .emacs alone.  Meanwhile closing this bug.

Many thanks for the report, martin

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