* lisp/emacs-lisp/tabulated-list.el: New optional print method
(tabulated-list-print): New optional argument, UPDATE. If non-nil, the list is printed by only adding and deleting the changed entries, instead of erasing the whole buffer. This method is much faster when few or no entries have changed. * doc/lispref/modes.texi (Tabulated List Mode): Document it. * etc/NEWS: Document it.
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