Richard Stallman schrieb:
>     1. Suppose I have two windows - SW is the selected one and UW the
>     unselected one.  I move the mouse to the menubar as described in Simon's
>     original scenario.  UW should not be selected here.  However, I then
>     change my mind and move the mouse to UW.  I suppose that UW should be
>     selected now - agreed?
> 
> Yes.  The question is how to distinguish the two cases.  I thought
> someone people suggested using a time delay for that, right.
> 
>     2. Currently `mouse-leave-buffer-hook' is not run when autoselecting
>     a window.  I believe this is a bug that should be resolved - agreed?
> 
> Yes, I think so; this should exit an isearch.
> 
> 

The attached patch is a first approximation.  I've been able to test this
on Windows 98 only, hence I would be glad to hear if this works in a general
context too - simply customize the variable `mouse-autoselect-window'.