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* doc/misc/efaq.texi (New in Emacs 27): Add section.

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Stefan Kangas 2020-12-21 15:57:30 +01:00
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@ -901,6 +901,7 @@ status of its latest version.
@menu
* Origin of the term Emacs::
* Latest version of Emacs::
* New in Emacs 27::
* New in Emacs 26::
* New in Emacs 25::
* New in Emacs 24::
@ -970,6 +971,63 @@ Emacs, type @kbd{C-h C-n} (@kbd{M-x view-emacs-news}). As of Emacs 22,
you can give this command a prefix argument to read about which features
were new in older versions.
@node New in Emacs 27
@section What is different about Emacs 27?
@cindex Differences between Emacs 26 and Emacs 27
@cindex Emacs 27, new features in
@itemize
@cindex bignum support
@item
Emacs now uses the GNU Multiple Precision (@acronym{GMP}) library to
support integers whose size is too large to support natively. The
integers supported natively are known as ``fixnums'', while the larger
ones are ``bignums''. All the arithmetic, comparison, and logical
(also known as ``bitwise'') operations where bignums make sense now
support both fixnums and bignums.
@cindex HarfBuzz
@item
Emacs now uses HarfBuzz as its default shaping engine.
@cindex JSON, native parsing
@item
Native support for @acronym{JSON} parsing that is much faster than
@file{json.el}.
@item
Cairo drawing is no longer experimental.
@cindex portable dumper
@item
Emacs now uses a ``portable dumper'' instead of unexec. This improves
compatibility with memory allocation on modern systems, and in
particular better supports the Address Space Layout Randomization
(@acronym{ASLR}) feature, a security technique used by most modern
operating systems.
@cindex XDG convention
@item
Emacs can now use the @acronym{XDG} convention for init files.
@cindex early init file
@item
Emacs can now be configured using an early init file. The primary
purpose is to allow customizing how the package system is initialized
given that initialization now happens before loading the regular init
file.
@cindex tabs
@item
Built-in support for tabs (tab bar and tab line).
@item
Support for resizing and rotating of images without ImageMagick.
@end itemize
Consult the Emacs @file{NEWS} file (@kbd{C-h n}) for the full list of
changes in Emacs 27.
@node New in Emacs 26
@section What is different about Emacs 26?
@cindex Differences between Emacs 25 and Emacs 26