GNU bug report logs - #19746
25.0.50; Emacs should treat synthetic up-events gracefully

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: David Kastrup <dak <at> gnu.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.0.50; Emacs should treat synthetic up-events gracefully
Date: Mon, 02 Feb 2015 20:15:12 +0100

[Message part 1 (text/plain, inline)]

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 (text/x-diff, attachment)]

[Message part 3 (text/plain, inline)]

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

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Load-path shadows:
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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)
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 (buffers 520 276)
 (heap 1024 63553 15724))

-- 
David Kastrup

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