When showing a combined diff, we are comparing two (or more)
parents to a final state, and some of these states may be
the same. Here's a table of the possible contents for a
given path (for two parents, but we will generalize to more
in a moment; we also omit isomorphic cases where the parents
On Tue, Jul 29, 2014 at 08:00:56AM -0400, Jeff King wrote:
The implementation just cuts the number of parents down to 1, but
otherwise runs through the same combined-diff code. The resulting
pairwise combined-diff differs from a normal diff in a few ways:
1. The header line is still diff
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