Based on the existing grep-edit-mode code.
* lisp/progmodes/xref.el (xref-edit--prepare-buffer): New function.
(xref-edit-mode-map, xref-edit-mode-hook): New variables.
(xref-edit-mode, xref-change-to-xref-edit-mode)
(xref-edit-save-changes): New functions.
(xref--xref-buffer-mode-map): New binding ("e").
* doc/emacs/maintaining.texi (Identifier Search):
Mention xref-change-to-xref-edit-mode.
* etc/NEWS: Describe the addition.
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.
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