bug#53216: 27.2; last line may be hidden in multi-line message

[martin rudalics]

> Evaluate the form below and type 't', multi-line message is shown.
> But I only see line '9' and line '10'.
> The last line '11' is not shown.
>
> (let ((buf (generate-new-buffer "tmp"))
>        (map (make-sparse-keymap))
>        (func (lambda ()
>                (interactive)
>                (message (propertize "1\n2\n3\n4\n5\n6\n7\n8\n9\n10\n11"
>                                     'face '(:height 5.0))))))
>    (switch-to-buffer buf)
>    (define-key map "t" func)
>    (use-local-map map))

The attached patch seems to fix this here but
'redisplay-adhoc-scroll-in-resize-mini-windows' is terra incognita for
me.

martin

xdisp.c.diff
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