going from:
activate -verbose
to:
reset -activation
results in:
reset -activationverbose"
instead of:
reset -activation
This is because we choose to insert "reset -" before the current line,
and the delete "e -" and insert "ion" in the appropriate place. The
cleareol code did not handle this case properly; we now cleareol to
the maximum number of characters of the first difference, the second
difference and the difference in line length.
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