using Gdk::Cursor

[Rob Benton <rob benton conwaycorp net>]

I was looking through the Gdkmm and Gdk docs at the Gdk::Cursor and 
Gdk::Window.  I notice that Gdk::Window has a set_cursor() method but 
not a get_cursor() method.
How would you go about changing a cursor to something like GDK_WATCH 
while processing something in your main window and then change it back 
to normal after that process was done?