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Run in a terminal window. Operating system seems not to matter; I can reproduce on both macOS and Linux. 2. Set environment variable MANWIDTH to 80 . 3. Start Emacs ('emacs -nw -Q'). 4. Do M-x man, enter the name of some manpage, and type RET. 5. Switch to the manpage window (C-x o), and scroll down by typing 'C-v' a few times. 6. Switch back to the *scratch* window (C-x o again). 7. After about a second, the manpage window jumps back to the beginning of the buffer. My *guess* is that this is related to the changes in commit 7e387c9e5265b98dbb3b986f8ab8ac2217052831, but that may well be a red herring. In GNU Emacs 29.3 (build 1, aarch64-apple-darwin23.4.0, NS appkit-2487.50 Version 14.4.1 (Build 23E224)) of 2024-04-28 built on agaton Repository revision: 8d7918ec1f42048ed994dfd0e4d582d8acaabd45 Repository branch: master System Description: macOS 15.1.1 Configured using: 'configure --prefix=/Users/ture/Nobackup/emacsbuild --with-ns --without-gif CPPFLAGS=-I/Users/ture/Nobackup/emacsbuild/include LDFLAGS=-L/Users/ture/Nobackup/emacsbuild/lib' Configured features: ACL GMP GNUTLS JPEG LIBXML2 MODULES NOTIFY KQUEUE NS PDUMPER PNG SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER ZLIB Important settings: value of $LC_CTYPE: sv_SE.UTF-8 value of $LC_MESSAGES: C value of $LANG: sv_SE.UTF-8 locale-coding-system: utf-8-unix Major mode: Fundamental Minor modes in effect: tooltip-mode: t global-eldoc-mode: t show-paren-mode: t mouse-wheel-mode: t tool-bar-mode: t menu-bar-mode: t file-name-shadow-mode: t global-font-lock-mode: t blink-cursor-mode: t buffer-read-only: t line-number-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t view-mode: t Load-path shadows: /Users/ture/Library/Emacs Lisp/python hides /Applications/Emacs.app/Contents/Resources/lisp/progmodes/python Features: (shadow sort mail-extr emacsbug message yank-media puny dired dired-loaddefs rfc822 mml mml-sec epa derived epg rfc6068 epg-config gnus-util text-property-search time-date mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils view term/screen term/xterm xterm ture-theme ansi-color finder-inf package browse-url url url-proxy url-privacy url-expand url-methods url-history url-cookie generate-lisp-file url-domsuf url-util mailcap url-handlers url-parse auth-source cl-seq eieio eieio-core cl-macs password-cache json subr-x map byte-opt gv bytecomp byte-compile url-vars cl-loaddefs cl-lib rmc iso-transl tooltip cconv eldoc paren electric uniquify ediff-hook vc-hooks lisp-float-type elisp-mode mwheel term/ns-win ns-win ucs-normalize mule-util term/common-win tool-bar dnd fontset image regexp-opt fringe tabulated-list replace newcomment text-mode lisp-mode prog-mode register page tab-bar menu-bar rfn-eshadow isearch easymenu timer select scroll-bar mouse jit-lock font-lock syntax font-core term/tty-colors frame minibuffer nadvice seq simple cl-generic indonesian philippine cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european ethiopic indian cyrillic chinese composite emoji-zwj charscript charprop case-table epa-hook jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button loaddefs theme-loaddefs faces cus-face macroexp files window text-properties overlay sha1 md5 base64 format env code-pages mule custom widget keymap hashtable-print-readable backquote threads kqueue cocoa ns multi-tty make-network-process emacs) Memory information: ((conses 16 81755 10005) (symbols 48 8456 0) (strings 32 27783 2349) (string-bytes 1 757038) (vectors 16 19632) (vector-slots 8 929234 167765) (floats 8 31 543) (intervals 56 292 0) (buffers 984 12))