Previewing changes

[Aaron Bentley]

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Ben Finney wrote:
> I'm very attached to 'diff --using foodiffprog'. Does 'merge
> --preview' allow specifying options to the 'diff' that is performed?

Not at present.  It was a hard choice, but I thought it was more
important to provide all the options of merge than all the options of
diff, so I put this functionality in the merge command rather than the
diff command.

Aaron
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