--text follows this line-- Windows 10: Steps to reproduce: 1. emacs -Q 2. M-x I-search-toggle-case-fold 3. Region is selected But I'm not select any region. In GNU Emacs 26.1 (build 1, x86_64-w64-mingw32) of 2018-05-30 built on CIRROCUMULUS Repository revision: 07f8f9bc5a51f5aa94eb099f3e15fbe0c20ea1ea Windowing system distributor 'Microsoft Corp.', version 10.0.17763 Recent messages: Undo! Quit Mark set [5 times] Undo! Quit Mark set [3 times] Undo! [2 times] Quit Mark set Undo! Configured using: 'configure --without-dbus --host=x86_64-w64-mingw32 --without-compress-install 'CFLAGS=-O2 -static -g3'' Configured features: XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS THREADS LCMS2 Important settings: value of $LANG: ENU locale-coding-system: cp1252 Major mode: Lisp Interaction Minor modes in effect: recentf-mode: t projectile-mode: t global-magit-file-mode: t diff-auto-refine-mode: t magit-auto-revert-mode: t auto-revert-tail-mode: t global-git-commit-mode: t async-bytecomp-package-mode: t shell-dirtrack-mode: t openwith-mode: t ido-vertical-mode: t ido-ubiquitous-mode: t ido-everywhere: t delete-selection-mode: t cua-mode: t show-paren-mode: t global-hl-line-mode: t electric-pair-mode: t tooltip-mode: t global-eldoc-mode: t eldoc-mode: t electric-indent-mode: t mouse-wheel-mode: t menu-bar-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t blink-cursor-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t column-number-mode: t line-number-mode: t transient-mark-mode: t Load-path shadows: None found. Features: (misearch multi-isearch shadow sort mail-extr emacsbug sendmail calc-map calc-stat calc-vec calc-misc js sgml-mode dom imenu cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs calc-menu calc-aent tramp-sh tramp tramp-compat tramp-loaddefs trampver ucs-normalize org-table dired-x vc-git magit-bookmark bookmark pp org-rmail org-mhe org-irc org-info org-gnus nnir gnus-sum gnus-group gnus-undo gnus-start gnus-cloud nnimap nnmail mail-source utf7 netrc nnoo parse-time gnus-spec gnus-int gnus-range gnus-win gnus nnheader org-docview doc-view jka-compr image-mode org-bibtex bibtex org-bbdb org-w3m org-element avl-tree generator org org-macro org-footnote org-pcomplete org-list org-faces org-entities org-version ob-emacs-lisp ob ob-tangle org-src ob-ref ob-lob ob-table ob-keys ob-exp ob-comint ob-core ob-eval org-compat org-macs org-loaddefs find-func cal-menu calendar cal-loaddefs recentf tree-widget yafolding xah-find visual-regexp uuid calc-comb calc-ext calc calc-loaddefs calc-macs cl smart-mode-line-light-theme smart-mode-line rich-minority smex restclient noutline outline projectile subr-x grep compile ibuf-ext ibuffer ibuffer-loaddefs multiple-cursors mc-hide-unmatched-lines-mode mc-separate-operations rectangular-region-mode mc-mark-pop mc-mark-more mc-cycle-cursors mc-edit-lines magit-obsolete magit-blame magit-stash magit-bisect magit-remote magit-commit magit-sequence magit-notes magit-worktree magit-tag magit-merge magit-branch magit-reset magit-collab ghub url-http tls gnutls url-gw nsm url-auth url url-proxy url-privacy url-expand url-methods url-history url-cookie url-domsuf url-util mailcap let-alist json map magit-files magit-refs magit-status magit magit-repos magit-apply magit-wip magit-log magit-diff smerge-mode diff-mode magit-core magit-autorevert autorevert filenotify magit-process magit-margin magit-mode git-commit magit-git magit-section magit-utils crm magit-popup log-edit easy-mmode message rmc puny format-spec rfc822 mml mml-sec epa derived epg gnus-util rmail rmail-loaddefs mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045 ietf-drums mailabbrev mail-utils gmm-utils mailheader pcvs-util add-log with-editor cl-extra help-mode async-bytecomp async shell pcomplete comint ansi-color server iedit iedit-lib multiple-cursors-core advice rect popup openwith ido-vertical-mode ido-completing-read+ memoize s cus-edit wid-edit minibuf-eldef ido-at-point ido highlight-symbol thingatpt dired-narrow dired-hacks-utils dired dired-loaddefs dash buffer-move windmove ace-window avy ring delsel cua-base mm-util mail-prsvr wheatgrass-theme paren hl-line elec-pair cus-start cus-load finder-inf info edmacro kmacro package easymenu epg-config url-handlers url-parse auth-source cl-seq eieio eieio-core cl-macs eieio-loaddefs password-cache url-vars seq byte-opt gv bytecomp byte-compile cconv cl-loaddefs cl-lib time-date mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type mwheel dos-w32 ls-lisp disp-table term/w32-win w32-win w32-vars term/common-win tool-bar dnd fontset image regexp-opt fringe tabulated-list replace newcomment text-mode elisp-mode lisp-mode prog-mode register page menu-bar rfn-eshadow isearch timer select scroll-bar mouse jit-lock font-lock syntax facemenu font-core term/tty-colors frame cl-generic 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 charscript charprop case-table epa-hook jka-cmpr-hook help simple abbrev obarray minibuffer cl-preloaded nadvice loaddefs button faces cus-face macroexp files text-properties overlay sha1 md5 base64 format env code-pages mule custom widget hashtable-print-readable backquote w32notify w32 lcms2 multi-tty make-network-process emacs) Memory information: ((conses 16 596417 124859) (symbols 56 48572 0) (miscs 48 323 498) (strings 32 135504 4864) (string-bytes 1 4191037) (vectors 16 80210) (vector-slots 8 1804035 97052) (floats 8 307 380) (intervals 56 8936 955) (buffers 992 29))