* lisp/vc/vc.el (vc-find-revision-no-save): New defcustom (bug#33319). (vc-find-revision): Depending on vc-find-revision-no-save, call either vc-find-revision-no-save or vc-find-revision-save. (vc-find-revision-save): Rename from vc-find-revision. (vc-find-revision-no-save): New function. * lisp/vc/diff-mode.el (diff-find-source-location): Let-bind vc-find-revision-no-save to t.
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