bug#66558: 29.1; .Xmodmap Win-key configurations cause keybinding issues

bug#66558: 29.1; .Xmodmap Win-key configurations cause keybinding issues

[Dev Null]

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The following lines of my '~/.Xmodmap' file remap my left Win key
to Ctrl:

remove mod4 = Super_L
add control = Super_L

When I run GUI Emacs with this in place, entering any keybinding 'C-s-X
is undefined', where X is the key that I pressed. E.g. if I press 'C-n',
I get the following:

'C-s-n is undefined'

In GNU Emacs 29.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.38,
cairo version 1.17.8)
Windowing system distributor 'The X.Org Foundation', version 11.0.12101008
System Description: Arch Linux

Configured using:
 'configure --sysconfdir=/etc --prefix=/usr --libexecdir=/usr/lib
 --with-tree-sitter --localstatedir=/var --with-cairo
 --disable-build-details --with-harfbuzz --with-libsystemd
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 'LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -flto=auto''

Configured features:
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JSON LCMS2 LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY INOTIFY
PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS
TREE_SITTER WEBP X11 XDBE XIM XINPUT2 XPM GTK3 ZLIB

Important settings:
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  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
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  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
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  blink-cursor-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:
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Memory information:
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 (symbols 48 5151 0)
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bug#66558: 29.1; .Xmodmap Win-key configurations cause keybinding issues

[Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Dev Null <patriot.game@gmail.com> writes:

> The following lines of my '~/.Xmodmap' file remap my left Win key
> to Ctrl:
>
> remove mod4 = Super_L
> add control = Super_L
>
> When I run GUI Emacs with this in place, entering any keybinding 'C-s-X
> is undefined', where X is the key that I pressed. E.g. if I press 'C-n',
> I get the following:
>
> 'C-s-n is undefined'

My powers of clairvoyance enable me to deduce that another key is bound
to control, in all likelihood Control_L.  You must remove _every_ key
from a real modifier you rebind, or Emacs will rightly attribute to
events with it pressed the detritus of previous bindings that remains.

bug#66558: 29.1; .Xmodmap Win-key configurations cause keybinding issues

[Dev Null]

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Sorry, I’m a little confused. The Win key appears to be recognized by Emacs
as the ’S’ modifier. If I run Emacs without that .Xmodmap file, and I hit
the left win key + n, I get ’S-n’. If I use an Xmodmap file consisting of
just those two lines and hit the left win key + n, I get 'C-s-n'. So it
appears that after the Xmodmap is read, Emacs is still recognizing my Win
key as being bound to super, while other programs on my system don't seem
to have that issue. I'm having trouble understanding why keys bound to
control are the issue here.

On Sun, Oct 15, 2023 at 8:56 PM Po Lu <luangruo@yahoo.com> wrote:

> Dev Null <patriot.game@gmail.com> writes:
>
> > The following lines of my '~/.Xmodmap' file remap my left Win key
> > to Ctrl:
> >
> > remove mod4 = Super_L
> > add control = Super_L
> >
> > When I run GUI Emacs with this in place, entering any keybinding 'C-s-X
> > is undefined', where X is the key that I pressed. E.g. if I press 'C-n',
> > I get the following:
> >
> > 'C-s-n is undefined'
>
> My powers of clairvoyance enable me to deduce that another key is bound
> to control, in all likelihood Control_L.  You must remove _every_ key
> from a real modifier you rebind, or Emacs will rightly attribute to
> events with it pressed the detritus of previous bindings that remains.
>

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bug#66558: 29.1; .Xmodmap Win-key configurations cause keybinding issues

[Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Dev Null <patriot.game@gmail.com> writes:

> Sorry, I’m a little confused. The Win key appears to be recognized by
> Emacs as the ’S’ modifier. If I run Emacs without that .Xmodmap file,
> and I hit the left win key + n, I get ’S-n’. If I use an Xmodmap file
> consisting of just those two lines and hit the left win key + n, I get
> 'C-s-n'. So it appears that after the Xmodmap is read, Emacs is still
> recognizing my Win key as being bound to super, while other programs
> on my system don't seem to have that issue. I'm having trouble
> understanding why keys bound to control are the issue here.

My mistake.  When you rebind Super to a non-virtual modifier bit such as
control through xmodmap, the XKB virtual modifier Super is also assigned
to that bit.

Emacs 29 no longer respects such misconfigurations when the XKB
extension is enabled on the X server.  Since the control modifier bit is
furthermore uniformly interpreted as Control, any event arriving with
ControlMask set always matches both the predefined Control modifier and
the Super virtual modifier established during display setup.  I think
the solution is for you to assign the Super keysyms to Control through
XKB, while I devise a fix for Emacs 30.