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emacs/lisp
Spencer Baugh abc2d39e01 Use 'regexp-opt' in 'dired-omit-regexp'
In my benchmarking, for large dired buffers, using 'regexp-opt'
provides around a 3x speedup in omitting.

'regexp-opt' takes around 5 milliseconds, so to avoid slowing
down omitting in small dired buffers we cache the return value.

Since omitting is now 3x faster, increase 'dired-omit-size-limit'
by 3x.  Also, document 'dired-omit-size-limit' better.

* doc/misc/dired-x.texi (Omitting Variables): Document
'dired-omit-size-limit'.
* etc/NEWS: Announce increase of 'dired-omit-size-limit'.
* lisp/dired-x.el (dired-omit--extension-regexp-cache): Add.
(dired-omit-regexp): Use 'regexp-opt'.  (Bug#69775)
(dired-omit-size-limit): Increase and improve docs.
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This directory contains source code for the parts of Emacs that are
written in Emacs Lisp.  *.el files are Emacs Lisp source, and the
corresponding *.elc files are byte-compiled versions.  Byte-compiled
files are architecture-independent.

The term subdirectory contains Lisp files that customize Emacs for
certain terminal types.  When Emacs starts, it checks the TERM
environment variable to get the terminal type and loads
'term/${TERM}.el' if it exists.

The other subdirectories hold Lisp packages grouped by their general
purpose.