Emacs' mouse event code deals with the up- modifier (bit 0 in the modifier mask) by converting it to click- or drag-events. This happens at the C level. However, when synthesizing events for things like Midi keyboards (basically computerized music instruments), it makes sense _not_ to convert an up-key event to either a drag or click event since usually the down-event is a principal event of its own: basically the "importance relation" of down- and up-events is reversed for those kinds of keys as compared to mouse buttons and this reflects in what kind of event one would want representing it. This patch allows the keymap machinery to treat the up- modifier in a manner analog to the down-modifier even though Emacs will not (yet) natively generate up-events itself. However, it will allow sensible behavior for such events being pushed into unread-command-events. It has been proposed on the Emacs developer list on <URL:http://lists.gnu.org/archive/html/emacs-devel/2015-01/msg00987.html> and had some comments amended at <URL:http://lists.gnu.org/archive/html/emacs-devel/2015-01/msg00993.html>. However, there was an additional request at <URL:http://lists.gnu.org/archive/html/emacs-devel/2015-01/msg01031.html> to change one comment in read_key_sequence to actions not matching the code in read_key_sequence but rather happening in make_lispy_event. The explanation why this change would be inappropriate in <URL:http://lists.gnu.org/archive/html/emacs-devel/2015-01/msg01035.html> was after an additional exchange "resolved" with an ad hominem attack in <URL:http://lists.gnu.org/archive/html/emacs-devel/2015-01/msg01065.html>. Further private communication led to no results. In order to at least provide users in need of this functionality with a referenceable issue report (and possibly get someone else to apply the patch), I am submitting the patch against current master here.
0001-Let-input-queue-deal-gracefully-with-up-events.patch
Description: Text Data
In GNU Emacs 25.0.50.2 (i686-pc-linux-gnu, GTK+ Version 3.12.2) of 2014-12-19 on lola Repository revision: c683666bcd0f0675ba72894a4a6374cf15849385 Windowing system distributor `The X.Org Foundation', version 11.0.11600000 System Description: Ubuntu 14.10 Configured using: `configure --without-toolkit-scroll-bars' Configured features: XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS NOTIFY LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB Important settings: value of $LC_MONETARY: en_US.UTF-8 value of $LC_NUMERIC: en_US.UTF-8 value of $LC_TIME: en_US.UTF-8 value of $LANG: en_US.UTF-8 value of $XMODIFIERS: @im=ibus locale-coding-system: utf-8-unix Major mode: Fundamental Minor modes in effect: shell-dirtrack-mode: t TeX-PDF-mode: t diff-auto-refine-mode: t desktop-save-mode: t minibuffer-electric-default-mode: t tooltip-mode: t global-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 line-number-mode: t Recent messages: No more unread articles Making completion list... Found `patches, sending' in Concept Index. (Only match) Quit Are you sure you want to quit reading news? (y or n) y (No changes need to be saved) Saving /home/dak/.newsrc.eld... Saving file /home/dak/.newsrc.eld... Wrote /home/dak/.newsrc.eld Saving /home/dak/.newsrc.eld...done Load-path shadows: None found. Features: (shadow emacsbug sgml-mode nndoc tramp-cache tramp-sh tramp tramp-compat tramp-loaddefs trampver shell pcomplete gnus-dup help-mode debug thingatpt pp rfc2368 sendmail nnir flow-fill shr dom subr-x pcase browse-url mm-archive mule-util sort smiley gnus-cite mail-extr gnus-async gnus-bcklg gnus-kill qp gnus-ml disp-table pop3 nndir nndraft nnmh gnutls network-stream nsm auth-source cl-macs gv eieio eieio-core starttls nnml nnfolder nnnil gnus-agent gnus-srvr gnus-score score-mode nnvirtual gnus-msg gnus-art mm-uu mml2015 mm-view mml-smime smime password-cache dig mailcap nntp gnus-cache gnus-sum gnus-group gnus-undo gnus-start gnus-cloud nnimap nnmail mail-source tls utf7 netrc nnoo parse-time gnus-spec gnus-int gnus-range message format-spec rfc822 mml mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045 ietf-drums mailabbrev gmm-utils mailheader gnus-win sh-script smie executable make-mode smerge-mode scheme latexenc nxml-uchnm rng-xsd xsd-regexp rng-cmpct rng-nxml rng-valid rng-loc rng-uri rng-parse nxml-parse rng-match rng-dt rng-util rng-pttrn nxml-ns nxml-mode nxml-outln nxml-rap nxml-util nxml-glyph nxml-enc xmltok dired-x dired python json tex-info texinfo autorevert filenotify cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs lilypond-mode compile comint ansi-color ring bug-reference add-log preview prv-emacs reftex-dcr reftex-auc reftex reftex-vars tex-bar tex-buf toolbar-x noutline outline font-latex byte-opt bytecomp byte-compile cl-extra cconv latex edmacro kmacro tex-style tex dbus xml crm vc-git diff-mode easy-mmode jka-compr info easymenu package epg-config advice desktop frameset minibuf-eldef gnus gnus-ems nnheader gnus-util mail-utils mm-util help-fns mail-prsvr wid-edit cl-loaddefs cl-lib cus-start cus-load preview-latex tex-site auto-loads server time-date tooltip eldoc electric uniquify ediff-hook vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment elisp-mode lisp-mode prog-mode register page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean japanese hebrew greek romanian slovak czech european ethiopic indian cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer 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 make-network-process dbusbind gfilenotify dynamic-setting system-font-setting font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs) Memory information: ((conses 8 739868 45106) (symbols 24 52766 375) (miscs 20 1596 1711) (strings 16 120678 18300) (string-bytes 1 3817797) (vectors 8 47334) (vector-slots 4 1796732 49030) (floats 8 385 606) (intervals 28 63060 1020) (buffers 520 276) (heap 1024 63553 15724)) -- David Kastrup
--- End Message ---