Re: [RFC PATCH] xdiff/xpatience: support anchoring a line

Jonathan Tan [off-list ref] writes:

Teach the patience diff to support prohibiting a user-specified line
from appearing as a deletion or addition in the end result.

Signed-off-by: Jonathan Tan <redacted>
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I'm sending this out to see if a change similar to this would be
welcome. It is useful to me as a reviewer (to check my own code, e.g.
when checking [1]). Probably more design needs to go into this,
including the best way to specify the "anchor" line, and the correct
behavior when the anchor is either not found or appears more than once.

Any thoughts?

This is a natural extension of the idea the patience algorithm is
built upon.  If this were a cumulative command line option that can
be given to specify multiple lines and can be used across the diff
family, it would make a welcome addition, I would think.