Enhancement to also use the external diff tool for new and deleted files.

[Aaron Bentley]

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David Ingamells wrote:
> I suspect that it would be a thankless task trying to maintain a list of
> various diff tools and how to call them.

We do that with mail clients, and things seem to have settled down.

> Wouldn't it be more sense to
> add a new option to diff --using to control this? Something like
>     -diffstyle visual|stdout|tree|...

That's certainly a reasonable way to proceed.  Since --diffstyle
wouldn't make sense without --using, we can also consider using
prefixes, like: --using visual:meld.

> Where the default is "stdout" and is the current method and "visual"
> tries to give all changes it can to a visual diff tool (e.g. meld).

I'm not sure that the names you're suggesting make sense, because I
think there may be a lot of difference between visual tools.  E.g.
gvimdiff is single-file, while meld supports whole trees.  Especially, I
wonder how symlinks should be handled.  I presume that you don't want to
see anything on the console when you use a visual tool...

Aaron
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