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RangeDifference was introduced in 89f8141a7 (2008) by Guy Van den
Broeck as part of his experimental "wikidiff3" engine.
Wikidiff3 was mostly removed in dcac5f19 (2009), although the Wikidiff3
class itself remained until 20f066e97 (2016) when it was merged into
DiffEngine. The merge left diff_range() as an unused method with no
visibility modifier being the only caller of RangeDifference. "private"
was eventually added, and then finally the unused private method was
deleted, leaving no callers in core or extensions.
Change-Id: I11fd03b9b36449620518b94e2c4be02da32d1271
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