bug#65068: 29.1; xkb-interception interaction causes problems with key combinations

[Alexander Prähauser]

Sorry for the late reply.

> Which virtual modifier key have you assigned to the apostrophe 
> key?

I've made the apostrophe key (AC11 in xkb) a level 3 switch 
through the following function:

> // The AC11 key (while pressed) chooses the third shift level.
> partial modifier_keys
> xkb_symbols "ac11_switch" {
>   key <AC11> {
>     type[Group1]="ONE_LEVEL",
>     symbols[Group1] = [ ISO_Level3_Shift ]
>   };
> };

If tapped it sends an F14 signal (which I use in Emacs to insert 
math symbols in cdlatex).

> Nit: Emacs is not developed on GitHub, but on Savannah:

I see. What I meant was that I built it using the emacs-git entry 
in the AUR.

Po Lu [2023-08-09 Wed 08:02] wrote:

> Alexander Prähauser <alexander.praehauser@gmx.at> writes:
>
> > I'm using the interception-`dual-function-keys`-plugin
> >
> > https://gitlab.com/interception/linux/plugins/dual-function-keys
> >
> > for my keyboard layout. In version 28.2 it worked perfectly, 
> > but
> > now, if I try to use combinations using keys that have
> > a dual function, the combination breaks off sending the wrong
> > signals. For instance, my CapsLock key has a dual function,
> > sending a F15 (XF86Launch5) if tapped and acting as the
> > apostrophe-key (AC11 in xkb) if held, which is configured in 
> > xkb
> > to act as an xkb level 3 modifier.
>
> Which virtual modifier key have you assigned to the apostrophe 
> key?
>
> > However, now when I try to use
> > CapsLock for a key combination using a level 3 symbol, for
> > instance if I hold Control, then press CapsLock, it seems to 
> > send
> > simply the apostrophe-key, so that I receive the
> > message "C-' is undefined" and the key sequence is broken 
> > off. If
> > I continue to hold both Control and CapsLock, it seems
> > to access level 3 normally though, so that I can still use
> > combinations consisting of C-[level 3 character]. If I only 
> > want
> > to access a level 3 symbol by holding CapsLock, it works 
> > normally,
> > it seems
> > only combinations are affected. While typing this message I
> > noticed an even weirder thing: my F-key is configured to
> > have "a" on level and "Right" on level 5, and Rightalt is
> > configured to act as a level 5 modifier if held, and if I
> > press the F key normally or while holding Rightalt this works, 
> > but
> > if I first hold Control, then Rightalt, then tap the
> > F-key, it seems to interpret the result as C-f, even though on 
> > no
> > xkb-level the F-key is configured to actually send f.
> >
> > The problem persists if I instead build the latest 
> > Emacs-version
> > (30.1) from Github
>
> Nit: Emacs is not developed on GitHub, but on Savannah:
>
>   https://git.sv.gnu.org/cgit/emacs.git