bug#23092: 25.0.92; Minibuffer completion fails to resize completion window if reused during same command

[martin rudalics]

> When TAB is pressed during entry of a command in the minibuffer, a
> window appears displaying a list of completions. To some extent this
> window seems to be sized to fit the number of completions. If the
> user enters more of the command and presses TAB again the contents
> of the completions window are refreshed but the window is not resized.
>
> This is impossible to use if there are very few completions when TAB
> is pressed the first time, resulting in a very tiny window, and
> there are very many completions when TAB is pressed the second time.
> This can happen, for example, when finding a file.
>
> For example, from the Emacs build directory:
>
>      src/emacs -Q
>
>      C-x C-f            ; find-file
>      lib/v TAB          ; A tiny window pops up with "verify.h" and "vla.h."
>      <backspace> s TAB
>
> At this point there is still a tiny completions window with about 50
> completions most of which are not visible in the window.
>
> On the other hand,
>
>      C-x C-f lib/s TAB
>
> displays the same completions in a much larger completion window
> (looks like it's half the frame height), so most of the available
> completions can be seen.

Please try again with ‘temp-buffer-resize-mode’ enabled.  I always
wanted to enable it by default but a number of people didn't like it so
I dropped the idea.

martin