Package: emacs;
Reported by: Ihor Radchenko <yantar92 <at> gmail.com>
Date: Sun, 7 Mar 2021 04:33:02 UTC
Severity: normal
Found in version 28.0.50
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From: Ihor Radchenko <yantar92 <at> gmail.com> To: 46982 <at> debbugs.gnu.org Subject: bug#46982: 28.0.50; after-change-functions in an indirect buffer are not called if the change is done while base buffer is active (and vice versa) Date: Sun, 07 Mar 2021 12:36:01 +0800
Steps to reproduce: 1. emacs -Q 2. M-x clone-indirect-buffer <RET> 3. M-: (setq-local after-change-functions (append after-change-functions '((lambda (&rest _) (message "Buffer 1"))))) <RET> 4. C-x o 5. M-: (setq-local after-change-functions (append after-change-functions '((lambda (&rest _) (message "Buffer 2"))))) <RET> 6. Type something. "Buffer 2" message is displayed. "Buffer 1" message is _not_ displayed. 7. C-x o 8. Type something. "Buffer 1" message is displayed. "Buffer 2" message is _not_ displayed. Expected behaviour: Since changes in direct buffer would automatically change text in the indirect buffer, I expect the changes to trigger all the after-change-functions in all the indirect buffers and the base buffer, regardless of which buffer was active when changes were made. The current behaviour can potentially break major modes using after-change-functions if base buffer and indirect buffer do not have the same major mode. For my use-case, an after-change-function I want to implement depends on buffer-local variable (which is set to different values in the base and indirect buffers) and I expect it to run in both buffers. Current Emacs behaviour leaves me with no options to handle changes made not in current buffer, even though they do change the text in other (indirect or base) buffer. On the other hand, running after-change-functions in every indirect/base buffer may lead to multiple invocations of the same function. Maybe, Emacs can examine something like 'run-indirect symbol for each element in after-change-functions and run the functions containing the symbol in all the connected buffers upon change. Best, Ihor In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, cairo version 1.16.0) of 2021-02-20 built on localhost Repository revision: 39792cf62987ecc1a772f6a2027d6b32c70e8312 Repository branch: feature/native-comp Windowing system distributor 'The X.Org Foundation', version 11.0.12010000 System Description: Gentoo/Linux Configured using: 'configure --prefix=/usr --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --disable-silent-rules --docdir=/usr/share/doc/emacs-28.0.9999 --htmldir=/usr/share/doc/emacs-28.0.9999/html --libdir=/usr/lib64 --program-suffix=-emacs-28-vcs --includedir=/usr/include/emacs-28-vcs --infodir=/usr/share/info/emacs-28-vcs --localstatedir=/var --enable-locallisppath=/etc/emacs:/usr/share/emacs/site-lisp --without-compress-install --without-hesiod --without-pop --with-file-notification=inotify --with-pdumper --enable-acl --with-dbus --with-modules --without-gameuser --with-libgmp --without-gpm --with-json --without-kerberos --without-kerberos5 --without-lcms2 --with-xml2 --without-mailutils --with-selinux --with-gnutls --without-libsystemd --with-threads --with-wide-int --with-zlib --with-sound=oss --with-x --without-ns --without-gconf --without-gsettings --without-toolkit-scroll-bars --with-gif --with-jpeg --with-png --with-rsvg --with-tiff --with-xpm --with-imagemagick --with-xft --with-cairo --with-harfbuzz --without-libotf --without-m17n-flt --with-x-toolkit=no --with-dumping=pdumper --with-nativecomp 'CFLAGS=-march=native -pipe -O2' CPPFLAGS= 'LDFLAGS=-Wl,-O1 -Wl,--as-needed'' Configured features: ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS HARFBUZZ IMAGEMAGICK JPEG JSON LIBSELINUX LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY OLDXMENU PDUMPER PNG RSVG SOUND THREADS TIFF X11 XDBE XIM XPM ZLIB Important settings: value of $LC_COLLATE: C value of $LANG: en_US.utf8 locale-coding-system: utf-8-unix Major mode: Lisp Interaction Minor modes in effect: org-edna-mode: t eros-mode: t pdf-occur-global-minor-mode: t TeX-PDF-mode: t which-key-mode: t global-aggressive-indent-mode: t aggressive-indent-mode: t diredfl-global-mode: t dired-async-mode: t winner-mode: t recentf-mode: t helm-adaptive-mode: t helm-global-mode: t helm-mode: t helm--remap-mouse-mode: t async-bytecomp-package-mode: t eval-sexp-fu-flash-mode: t global-highlight-parentheses-mode: t highlight-parentheses-mode: t el-patch-use-package-mode: t global-git-commit-mode: t magit-auto-revert-mode: t shell-dirtrack-mode: t hl-todo-mode: t pretty-symbols-mode: t company-mode: t persistent-scratch-autosave-mode: t savehist-mode: t boon-mode: t boon-local-mode: t global-hl-line-mode: t global-page-break-lines-mode: t page-break-lines-mode: t shackle-mode: t golden-ratio-mode: t gcmh-mode: t override-global-mode: t straight-use-package-mode: t straight-package-neutering-mode: t global-eldoc-mode: t eldoc-mode: t electric-indent-mode: t mouse-wheel-mode: t global-prettify-symbols-mode: t prettify-symbols-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t window-divider-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t line-number-mode: t transient-mark-mode: t abbrev-mode: t Features: (shadow emacsbug sendmail helm-misc avy font-latex context-en context plain-tex tex-buf ...) Memory information: ((conses 16 32697775 2032831) (symbols 48 96430 1) (strings 32 2157335 426732) (string-bytes 1 82214460) (vectors 16 799796) (vector-slots 8 11991333 1566948) (floats 8 211915 16922) (intervals 56 1417577 35086) (buffers 992 180))
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