Add xref-edit-mode (bug#80616)

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.

1 files changed, 5 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 2b4e81fee14..335778d248a 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -3202,6 +3202,11 @@ This minor mode binds 'xref-find-definitions-at-mouse' to
 definition, following the convention from other editors.  The global
 minor mode 'global-xref-mouse-mode' will enable this in all buffers.
 
++++
+*** New command 'xref-change-to-xref-edit-mode'.
+It's bound to "e" and it switches an Xref buffer into an "editable" mode
+like similar features in Occur and Grep buffers.
+
 ** Revert
 
 +++