Fix for issue #20 correcting empty-context add-only patches - #37
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Empty-context add-only patches were applied in the wrong place, typically one line early. This commit uses the code submitted in the issue but tidied up and corrected for current master snapshot.
Bad copy&paste caused use of InsertDelta instead of DeleteDelta when applying fix for issue #20. Also improved test to cover empty-context patches that delete lines to cover this case.
DiffUtils.generateUnifiedDiff() produced off-by-one positions for hunks with empty context/content. EmptyContextUnifiedDiffTest.java has been improved to test for this. (Some test resource files renamed in light of more general use).
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Empty-context add-only patches were applied in the wrong place,
typically one line early.
This commit uses the code submitted in the issue but tidied up
and corrected for current master snapshot.