(diff-context->unified): Use `region-beginning' and `region-end'
instead of `mark' and `point'. (diff-unified->context, diff-reverse-direction, diff-fixup-modifs): Operate on region in Transient Mark mode when the mark is active. Use `region-beginning' and `region-end' instead of `mark' and `point'. (diff-hunk-text, diff-goto-source): Doc fix.
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