bug#64300: 28.2; Can no longer input some tokens.

[Eli Zaretskii <eliz@gnu.org>]

Ping!  Christian, can you please answer Po Lu's questions?  I'd like
to continue investigating this issue, and in particular establish
whether this issue is present in the upcoming Emacs 29.

> From: Po Lu <luangruo@yahoo.com>
> Cc: Christian Brolin <cbrolin@gmail.com>,  64300@debbugs.gnu.org
> Date: Sat, 01 Jul 2023 17:41:24 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> Date: Mon, 26 Jun 2023 09:30:31 +0200
> >> From: Christian Brolin <cbrolin@gmail.com>
> >> 
> >> I'm using a Swedish keyboard and running emacs in Kubuntu 23.04. From
> >> today, I can no longer input, e.g. ~ or ^ by typing AltGr-X or Shift-X
> >> where X is the key left to the Enter key, containing those symbols as
> >> well as a horizontal colon.
> >> 
> >> When this was working, I pressed the X key in combination with a letter or
> >> most often space. Now I just get a small pop-up with a gray background
> >> containing the symbolunderlined. I don't know what to do with this
> >> pop-up. It I press space or any other key it just disappear and nothing
> >> goes into my buffer. I tried to click on it with the mouse but it
> >> doesn't react. Also, if I first click on of the AltGr-X or Shift-X and
> >> then the other the pop-up expands to show both symbols and then I can
> >> add more of them even without alternate. Don't know how this is useful.
> >> 
> >> Btw, the ~ and ^ in this report I got by entering them in the terminal
> >> can copied them from there.
> >
> > Can someone please look into this?  I don't have access to GNU/Linux
> > systems localized that way.
> 
> Thanks.  Christian, are you encountering this problem in Emacs 28.2, or
> in the Emacs 29 pretests?
> 
> And finally, what was the last version of Emacs in which you remember
> this working?
>