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Chong Yidong authored
* vc/diff-mode.el (diff-vc-backend): New var. * vc/vc.el (vc-deduce-backend): New fun. Handle diff buffers. (vc-root-diff, vc-print-root-log, vc-log-incoming) (vc-log-outgoing): Use it. (vc-diff-internal): Set diff-vc-backend.
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