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bug#17412: 24.3; Unicode key events broken, not usable in input method

From: Stefan Dorn
Subject: bug#17412: 24.3; Unicode key events broken, not usable in input method
Date: Mon, 5 May 2014 23:29:52 +0100

My keyboard layout includes Unicode keys like "ł", U+0142 (l with
stroke), and combining diacritics (U+0300 etc). I've been trying to use
them in quail layouts, eg:

  "custom" "custom layout" "^" t
  "Proof-of-concept layout." nil t t nil nil nil nil nil nil nil t)

  (quail-define-rules ("ł" ?l))

The key is never passed into the input-method-function, and so just
inserted literally. (Typing Unicode keys directly works fine.)

Digging around in keyboard.c, I found that read_char() only passes
events with keycode < 256 (line 3050ff) to input-method-function:

  /* Pass this to the input method, if appropriate.  */
  if (INTEGERP (c)
      && ! NILP (Vinput_method_function)
      /* Don't run the input method within a key sequence,
     after the first event of the key sequence.  */
      && NILP (prev_event)
      && ' ' <= XINT (c) && XINT (c) < 256 && XINT (c) != 127)

Using read-key-sequence, Emacs seems to parse "ł" as [322] (0x142 in
decimal). Disabling the condition in read_char() (so the key is
actually passed to quail) only seems to cause an infinite loop in quail
that I've not been able diagnose yet.

[322] as key event seems strange to me. The XLib keycode for "ł" (as
reported by xev) is 0x1000142. Maybe Emacs cuts off the leading bit?

Interestingly, quail shows the key in the guidance screen just fine, ie:

  (quail-define-rules ("xł" ?l))

and typing "x" correctly suggest "xł" as a pattern; it's just impossible
to pass "ł" to quail and have it be parsed correctly.

In GNU Emacs 24.3.1 (x86_64-pc-linux-gnu, X toolkit)
 of 2014-05-05 on scabeiathrax
Windowing system distributor `The X.Org Foundation', version 11.0.11500000
System Description:    NAME=Gentoo

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' '--libdir=/usr/lib64'
 '--disable-silent-rules' '--disable-dependency-tracking'
 '--program-suffix=-emacs-24' '--infodir=/usr/share/info/emacs-24'
 '--with-gameuser=games' '--without-compress-info' '--without-hesiod'
 '--without-kerberos' '--without-kerberos5' '--with-gpm' '--with-dbus'
 '--without-gnutls' '--without-xml2' '--without-selinux'
 '--without-wide-int' '--with-sound' '--with-x' '--without-ns'
 '--without-gconf' '--without-gsettings' '--without-toolkit-scroll-bars'
 '--with-gif' '--with-jpeg' '--with-png' '--with-rsvg' '--with-tiff'
 '--with-xpm' '--without-imagemagick' '--with-xft' '--with-libotf'
 '--with-m17n-flt' '--with-x-toolkit=lucid' '--with-xaw3d'
 'build_alias=x86_64-pc-linux-gnu' 'host_alias=x86_64-pc-linux-gnu'
 'CFLAGS=-O2 -pipe -march=core2' 'LDFLAGS=-Wl,-O1 -Wl,--sort-common
 -Wl,--hash-style=gnu -Wl,--as-needed' 'CPPFLAGS=''

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-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
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
( r e d a <backspace> <backspace> a d - k e y - s e
q u e n c e SPC " k e y : SPC " ) <left> <left> C-M-x
̈ C-M-x ł C-M-x e M-x b u g <tab> <backspace> <backspace>
<backspace> <backspace> <backspace> <backspace> <backspace>
<backspace> <backspace> <backspace> <backspace> <backspace>
<backspace> <backspace> r e p o <tab> r t <tab> <r

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Making completion list...

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mail-prsvr mail-utils help-mode easymenu time-date tooltip ediff-hook
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