Package: emacs;
Reported by: Jordan Ellis Coppard <jc+o.emacs <at> wz.ht>
Date: Wed, 25 Sep 2024 14:26:02 UTC
Severity: normal
Found in version 31.0.50
Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
From: Jordan Ellis Coppard <jc+o.emacs <at> wz.ht> To: bug-gnu-emacs <at> gnu.org Subject: 31.0.50; Minibuffer completions include nonsense prefix candidates Date: Wed, 25 Sep 2024 19:54:59 +0900
Hello, I've noticed that my completions have slowed down A LOT on recent Emacs builds, it turns out nonsense completion candidates (which I am calling "prefix candidates") are being included as... completion candidates. By my rough estimate this results in about... 10,000 extra completion candidates when invoking `C-h o` (with my personal Emacs configuration). To reproduce, using `emacs -Q` of course: 1. Open Emacs. 2. C-h o foo TAB Observe that completion candidate `footnote-` is listed and that there are 80 completion candidates. If I do the same on the currently released Emacs or another (older) build of Emacs (30.0.50) there are 79 (not 80) completion candidates and `footnote-` is not listed as one. This seems to be occurring for almost every unique prefix possible, compounding as time goes on. So later on `f-` is listed as a completion candidate, then also `go-` and so on. These are not valid completion candidates. `footnote-` is not a symbol. Over time the huge increase in completion candidate volume (and perhaps what is causing this behind the scenes) results in such a slowdown that I can visibly see Emacs crawl to 1 FPS when I type in minibuffer completion, when the exact same init.el on said older 30.0.50 is faster. This is reproduceable on `emacs -Q` as above, (and the useful bug report probably ends right here) but as an aside: my configuration is minimal, my Emacs starts up in about 0.3s and I keep things minimal because I do not want Emacs to ever take longer than instantaneously to respond to keystrokes (if it has to do some long-running job, or something which takes time that's different since feedback that such a thing has kicked off would/should still be instant). Tangentially to this, it would be nice if completions could be decoupled from the UI (i.e. they could stream in, with an API to let the user know when the list is complete) because even on 30.0.50 I can often times type faster than completion can handle which drives me insane (UI hitching)... but that's an aside. --- diagnostic info --- In GNU Emacs 31.0.50 (build 1, aarch64-apple-darwin23.5.0, NS appkit-2487.60 Version 14.5 (Build 23F79)) of 2024-09-16 built on yote.local Windowing system distributor 'Apple', version 10.3.2487 System Description: macOS 14.5 Configured using: 'configure --prefix=/opt/local --disable-silent-rules --without-dbus --without-gconf --without-libotf --without-m17n-flt --with-libgmp --with-gnutls --with-xml2 --with-modules --with-sqlite3 --with-webp --infodir /opt/local/share/info/emacs --with-native-compilation=no --with-ns --with-lcms2 --without-harfbuzz --without-imagemagick --without-xaw3d --with-rsvg --with-xwidgets --with-native-compilation=aot --with-tree-sitter 'CFLAGS=-pipe -Os -Wno-attributes -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX14.sdk -arch arm64' 'CPPFLAGS=-I/opt/local/include -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX14.sdk' 'LDFLAGS=-L/opt/local/lib -Wl,-headerpad_max_install_names -Wl,-no_pie -Wl,-rpath /opt/local/lib/gcc14 -Wl,-rpath /opt/local/lib -Wl,-syslibroot,/Library/Developer/CommandLineTools/SDKs/MacOSX14.sdk -arch arm64'' Configured features: ACL GIF GLIB GMP GNUTLS JPEG LCMS2 LIBXML2 MODULES NATIVE_COMP NOTIFY KQUEUE NS PDUMPER PNG RSVG SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM XWIDGETS ZLIB Important settings: value of $LC_ALL: en_US.UTF-8 value of $LC_CTYPE: en_US.UTF-8 value of $LANG: en_AU.UTF-8 locale-coding-system: utf-8-unix Major mode: Lisp Interaction Minor modes in effect: tooltip-mode: t global-eldoc-mode: t eldoc-mode: t show-paren-mode: t electric-indent-mode: t mouse-wheel-mode: t tool-bar-mode: t menu-bar-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t blink-cursor-mode: t minibuffer-regexp-mode: t line-number-mode: t indent-tabs-mode: t transient-mark-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t Load-path shadows: None found. Features: (shadow sort mail-extr emacsbug message mailcap yank-media puny dired dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg rfc6068 epg-config gnus-util text-property-search time-date subr-x mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader cl-loaddefs cl-lib sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils 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 xwidget-internal kqueue cocoa ns lcms2 multi-tty make-network-process native-compile emacs) Memory information: ((conses 16 48976 9047) (symbols 48 5284 0) (strings 32 13815 1840) (string-bytes 1 469136) (vectors 16 9182) (vector-slots 8 130405 8531) (floats 8 22 13) (intervals 56 279 5) (buffers 992 10))
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