[gtk-list] drag example 2. try

[Fritz Heinrichmeyer <fritz heinrichmeyer fernuni-hagen de>]

Now i did my homework and made a little drag demonstration. I find the
hash table lookup for having access to the place where the mouse press
occurred much to expensive. Maybe there should be a dragable variant for
container? There is still flickering but it works. Maybe it saves
someone's time:

myeditor.c