put input focus on active minibuffer

[Katsumi Yamaoka]

Hi,

This is a feature request.
It would be useful if the input focus is always put on the
active minibuffer when a user clicks the mouse on any place of
the unselected Emacs frame.  For instance, when an Emacs frame
is not selected and it is waiting for a user for a yes-or-no-p
answer, a user will likely click a normal window.  In that case,
a user will have to do `C-x o' to go to the minibuffer now.  I
can guess everyone has experienced such a situation. :)

Thanks.