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Subject: bug#75993: Special mode-class for diff-mode
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Tags: patch
Visiting a diff file and trying to copy lines with 'w' (diff-kill-ring-save)
does something unexpected since view-mode overrides 'w' with
'View-scroll-page-backward-set-page-size' for non-nil 'view-read-only'.
Here is the fix like for all modes that use single-letter keys:
diff --git a/lisp/vc/diff-mode.el b/lisp/vc/diff-mode.el
index 77807fc4f35..b88dd4bf736 100644
--- a/lisp/vc/diff-mode.el
+++ b/lisp/vc/diff-mode.el
@@ -1550,6 +1550,7 @@ diff-mode-read-only
(defvar whitespace-style)
(defvar whitespace-trailing-regexp)
+(put 'diff-mode 'mode-class 'special)
;;;###autoload
(define-derived-mode diff-mode fundamental-mode "Diff"
"Major mode for viewing/editing context diffs.
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Juri Linkov <juri@HIDDEN> Subject: bug#75993: Acknowledgement (Special mode-class for diff-mode) Message-ID: <handler.75993.B.173843141810907.ack <at> debbugs.gnu.org> References: <87wme9in8w.fsf@HIDDEN> X-Gnu-PR-Message: ack 75993 X-Gnu-PR-Package: emacs X-Gnu-PR-Keywords: patch Reply-To: 75993 <at> debbugs.gnu.org Date: Sat, 01 Feb 2025 17:37:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. As you requested using X-Debbugs-CC, your message was also forwarded to Stefan Monnier <monnier@HIDDEN> (after having been given a bug report number, if it did not have one). Your message has been sent to the package maintainer(s): bug-gnu-emacs@HIDDEN If you wish to submit further information on this problem, please send it to 75993 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 75993: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D75993 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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