cda65ffa58
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.