bug#12419: Mouse click changes layout

[martin rudalics]

>  > GNU Emacs 20.7.3 (i386-*-nt5.1.2600) of Thu Dec 21 2000 on buffy
>
> Strange.  Maybe my memory fails.

Only partially ;-)  On

GNU Emacs 20.7.1 (i386-*-nt5.1.2600) of Tue Jun 13 2000

with a three-windows-above-each-other frame I can track the uppermost
modeline down as far as I want.  I can't track it up though.  Same
behavior with

GNU Emacs 21.2.1 (i386-msvc-nt5.1.2600) of 2002-03-19

IIRC in the nineties it did work in both directions, but maybe with
XEmacs only.

martin