bug#38791: 27.0.60; Multiline mini-window fails to resize after clearing message

[Eli Zaretskii]

> From: martin rudalics <rudalics@gmx.at>
> Date: Sun, 29 Dec 2019 19:33:52 +0100
> 
>  > This is a regression, because in Emacs 26 this works as expected.
>  >
>  > The patch to fix this is below.  It reverts a small part of commit
>  > 8e0ebb9, which inadvertently changed the logic in grow_mini_window.
>  > The problem in this case was that old_height + delta evaluated to
>  > zero, but instead of limiting the result to the equivalent of 1 line,
>  > the code did nothing.
> 
> It apparently never entered my mind that WINDOW_BOX_TEXT_HEIGHT might
> mean something different from the height of that window's buffer text.
> Shameful.

Well, the name is ambiguous.

I installed the fix, and I'm closing the bug report.