* lisp/vc/log-view.el (log-view-diff): Extract `log-view-diff-common',
use it. (log-view-diff-changeset): Same. (log-view-diff-common): Call backend command `previous-revision' to find out the previous revision, in both cases. Swap the variables `to' and `fr', so that `fr' usually refers to the earlier revision. Fixes: debbugs:14989
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