emacs: too fast scroll speed when selecting region with mouse

["H.S." <hs.samix@gmail.com>]

Hello,

In emacs, if I start selecting a region in a buffer by clicking the left 
mouse button and dragging the mouse, the buffer scrolls extremely fast 
if the mouse moves beyond the lower end of the buffer window. How do I 
correct this behavior? I notice that "Mouse Scroll Min Lines" variable 
is set to 1, so by not moving the mouse too much outside the window, it 
should scroll the buffer by this amount. This doesn't happen however. 
The selected region reaches the end of the buffer in an instant if I 
drag the mouse only slightly outside the buffer window.

This is on Debian Testing with:
$> dpkg -l emacs* | grep ^i
ii  emacs21                   21.4a+1-5      The GNU Emacs editor
ii  emacs21-bin-common        21.4a+1-5      The GNU Emacs editor's 
shared, architecture
ii  emacs21-common            21.4a+1-5      The GNU Emacs editor's 
shared, architecture
ii  emacs21-el                21.4a+1-5      GNU Emacs LISP (.el) files
ii  emacsen-common            1.4.17         Common facilities for all 
emacsen


Any idea how to solve this one?

thanks,
->HS