Strange behaviour of the undo function

[Konrad Podczeck]

The following seems to be a bug:

Suppose the frame is splitted in say subwindow A and subwindow B. 
Select some text in A, yank it with mouse-2 somewhere in B, and then 
choose undo from the toolbar. The undo is done, but the point in B 
jumps to the position where the selection was made.

Emacs-implementation used: Aquamacs Emacs for OSX, but with the "-Q" 
option so that all Aquamacs specific customizations don't apply.

Konrad