Can hgk use an external diff tool

[TK Soh]

On 8/6/07, Sebastian Hauer <sebastian.hauer at gmail.com> wrote:
> Hi,
> I am wondering if there is a way to get hgk to use an external diff
> tool instead of printing a unified diff in the left hand panel.

I have a [fairly old] hack to add "Visual diff this -> selected" and
"Visual diff selected -> this" to the context menu. I can post the
diff if anyone is interested.