Gnome-shell OSK layouts are extracted from CLDR layout definitions:
https://www.unicode.org/cldr/charts/latest/keyboards/layouts/index.html
Updating these involves several steps:
1) Downloading and unzipping the tarball found at:
http://www.unicode.org/Public/cldr/latest/keyboards.zip
This file contains XML files describing the keyboard layouts.
2) Cloning the cldr2json script at:
git://repo.or.cz/cldr2json.git
It will be used to convert the XML files into JSON that can be
directly consumed by gnome-shell.
3) Running the script to produce the files:
./cldr2json <input-directory> <output-directory>
We shall usually use the "android" folder, since that's most
complete, and similar to our UI and target sizes. And the target
directory must be data/osk-layouts in this repository.
4) Modify gnome-shell-osk-layouts.gresource.xml to include the files
5) Do git add on the updated/new files, and git commit.
Or alternatively:
1) Run update-osk-layouts.sh
2) Do git add and git commit
da673639ca