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* Changes in Emacs 21.1
+** The new global minor mode `auto-image-file-mode' allows image files
+to be visited as images.
+
** The functions `keep-lines', `flush-lines' and `how-many' now
operate on the active region in Transient Mark mode.
* Lisp changes made after edition 2.6 of the Emacs Lisp Manual,
(Display-related features are described in a page of their own below.)
+** The new macro `with-auto-compression-mode' allows evaluating an
+expression with auto-compression-mode enabled.
+
** In image specifications, `:heuristic-mask' has been replaced
with the more general `:mask' property.