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master fcae435 2/2: Make revert-buffer preserve buffer-readedness

From: Lars Ingebrigtsen
Subject: master fcae435 2/2: Make revert-buffer preserve buffer-readedness
Date: Thu, 22 Jul 2021 10:25:09 -0400 (EDT)

branch: master
commit fcae435f598471a2911641412125c5ac4f73559f
Author: Lars Ingebrigtsen <larsi@gnus.org>
Commit: Lars Ingebrigtsen <larsi@gnus.org>

    Make revert-buffer preserve buffer-readedness
    * lisp/files.el (revert-buffer): Preserve buffer-readedness
 etc/NEWS      | 3 +++
 lisp/files.el | 4 +++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/etc/NEWS b/etc/NEWS
index bf19c34..95218fa 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -2804,6 +2804,9 @@ similar to prefix arguments, but are more flexible and 
 * Incompatible Editing Changes in Emacs 28.1
+** 'revert-buffer' will now preserve buffer-readedness.
+It previously switched the read-only flag off.
 ** 'electric-indent-mode' now also indents inside strings and comments,
 (unless the indentation function doesn't, of course).
 To recover the previous behavior you can use:
diff --git a/lisp/files.el b/lisp/files.el
index 0606ed6..412562f 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -6317,7 +6317,9 @@ preserve markers and overlays, at the price of being 
   ;; interface, but leaving the programmatic interface the same.
   (interactive (list (not current-prefix-arg)))
   (let ((revert-buffer-in-progress-p t)
-        (revert-buffer-preserve-modes preserve-modes))
+        (revert-buffer-preserve-modes preserve-modes)
+        ;; Preserve buffer-readedness.
+        (buffer-read-only buffer-read-only))
     (funcall (or revert-buffer-function #'revert-buffer--default)
              ignore-auto noconfirm)))

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