bug#35610: Freshly installed IBus intput method is not listed as an input source

[sirgazil]

Hi,

I installed the GNU system using the Guix System 1.0 ISO installer and 
reconfigured the system to work around the installer "%base-packages" bug 
(https://debbugs.gnu.org/cgi/bugreport.cgi?bug=35541).

When I install the "ibus-anthy" input method, I don't find any way of using it 
because it is not listed in the GNOME input sources, nor in the list of input 
methods in IBus Preferences.


## Steps to reproduce

1. guix install ibus ibus-anthy font-adobe-source-han-sans
2. Go to "GNOME Settings → Language & Region"
3. In "Input Sources", click on the Add button (+)
4. In the list that appears, select "Japanese"


## Unexpected result

"Japanese (Anthy)" is not listed.


## Expected result

"Japanese (Anthy)" is listed.

Also, adding it to the list of Input Sources enables a new option to the right 
of the GNOME top bar where you can select the different Input Sources you have 
set. When you choose the newly added Japanese (Anthy) you can start writing 
Japanese right away. For example, typing "aiueo" would result in "あいうえお".

Also, the keyboard combination Super+Space allows you to alternate between 
input sources


## Additional information

The Japanese (Anthy) input method is not listed in IBus preferences either. You 
can check by doing the following:

1. Click on Activities
2. Click on Show Applications
3. Click on IBus Preferences
4. Click on the Input Method tab
5. Click on the Add button
6. Click on Japanese

You should be able to see Anthy there, but it isn't.


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