bug#6818: word-chunked drag selection problem.

[David De La Harpe Golden]

This is a pretty independent bug reported in passing under #6774, don't 
want to lose it (unless of course someone's already fixed it), so taking 
the liberty of sticking it in the tracker separately:

On 04/08/10 19:02, Stefan Monnier wrote:
> I also noticed another change wrt selection: double-click and then drag
> only does "word-chunked selection" on the initial double-click but not
> on the susequent drag.
>