(vc-buffer-backend): New function.
Also new variable, local in all buffers. (vc-kill-buffer-hook): Kill local vc-buffer-backend. (vc-kill-buffer-hook): Don't put it on kill-buffer-hook. (vc-file-clearprops): Function moved here. (vc-workfile-version): Function moved here. (vc-mode-line): Don't call vc-locking-user. Add branch support for RCS; treat CVS more like RCS and SCCS. (vc-occurences, vc-trunk-p, vc-branch-p, vc-minor-revision) (vc-branch-part): new functions that operate on RCS revision numbers. (vc-status): Use the new property vc-workfile-version and vc-locking-user (see vc.el). Display "locking state" for CVS. (vc-find-cvs-master): Search for file name case-sensitively, store version number into the new property vc-workfile-version. (vc-find-file-hook): kill any remaining properties. Like this, when re-finding a file (for example because it has changed on disk), the version control state gets re-computed. (vc-mode-line): CVS case: make the buffer read-only if the file is unmodified. (vc-kill-buffer-hook): Clear file's vc props when buffer is killed.
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