bug#5908: tooltip-show breaks with multiline tip on Emacs for Windows v22.2.1

[D Chiesa]

Emacs doesn't properly display long text tooltips, or multi-line tooltips, 
on Windows.

You can see a picture of the problem here:
   http://i42.tinypic.com/qqu0ja.jpg

And you can demonstrate it for yourself by doing

(tooltip-show  "very very long string message........" )

You'll see that the last line in the displayed tooltip is clipped.

It seems that the size of the tooltip is not correctly calculated.

Appending a newline '\n' to the string to be displayed, allows the tooltip 
to be seen in its entirety, although with more "border" than is necessary on 
the bottom of the text.



In GNU Emacs 22.2.1 (i386-mingw-nt6.0.6001)
of 2008-03-26 on RELEASE
Windowing system distributor `Microsoft Corp.', version 6.0.6001
configured using `configure --with-gcc (3.4)'

Important settings:
 value of $LC_ALL: nil
 value of $LC_COLLATE: nil
 value of $LC_CTYPE: nil
 value of $LC_MESSAGES: nil
 value of $LC_MONETARY: nil
 value of $LC_NUMERIC: nil
 value of $LC_TIME: nil
 value of $LANG: ENU
 locale-coding-system: cp1252
 default-enable-multibyte-characters: t

Major mode: Emacs-Lisp

Minor modes in effect:
 yas/minor-mode: t
 shell-dirtrack-mode: t
 nxhtml-global-minor-mode: t
 encoded-kbd-mode: t
 tooltip-mode: t
 tool-bar-mode: t
 mouse-wheel-mode: t
 menu-bar-mode: t
 file-name-shadow-mode: t
 global-font-lock-mode: t
 font-lock-mode: t
 blink-cursor-mode: t
 unify-8859-on-encoding-mode: t
 utf-translate-cjk-mode: t
 auto-compression-mode: t
 line-number-mode: t

Recent input:
<backspace> s <down> <down> <down> <escape> SPC <up>
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up>
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up>
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up>
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up>
<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> C-u
C-x TAB C-w C-y <help-echo> <help-echo> C-x C-s C-x
b b <backspace> C-g C-x C-f f l y <tab> j <tab> <return>
<escape> > <up> <C-left> <C-left> <C-right> <right>
f o r - <down> C-x C-s C-x C-e <return> C-x b <return>
C-x C-e <return> <help-echo> <help-echo> C-p C-p C-p
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p
C-p C-p C-p C-n C-n C-k C-k C-k C-k C-k C-k C-y C-p
C-w C-k C-n C-n C-p C-e C-d C-c 1 C-e C-k C-c 1 C-e
C-k C-c 1 C-n C-a C-k C-k C-n C-k C-k C-k C-k C-k C-k
C-p C-p C-p <escape> SPC C-n C-n C-n C-n C-n C-n C-n
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n <escape>
C-r C-p C-p C-p C-p C-p C-p C-n <backspace> C-c 1 C-n
C-a <backspace> C-c 1 <backspace> C-b <backspace> C-p
C-p C-a <backspace> C-c 1 <backspace> C-e C-d C-c 1
<backspace> C-n C-n C-n C-a <backspace> C-c 1 <backspace>
C-n C-p C-n C-n C-n <escape> SPC C-p C-p C-p C-p C-p
C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-u C-x TAB
C-w C-y C-x C-s <help-echo> <escape> x r e p o r t
- e m <tab> <return>

Recent messages:
Wrote c:/Users/dinoch/elisp/flymake-for-jslint.el
Compiling c:/Users/dinoch/elisp/flymake-for-jslint.el...done
Wrote c:/Users/dinoch/elisp/flymake-for-jslint.elc
Compiling c:/Users/dinoch/elisp/flymake-for-csharp.el...done
Wrote c:/Users/dinoch/elisp/flymake-for-csharp.elc
Mark set
Mark activated
Mark set [2 times]
Wrote c:/Users/dinoch/elisp/flymake-for-csharp.el
Loading emacsbug...done