Should the name and the contents of the recently added schemafile also be adapted in the copy of the sub-theme?

Hello,

Yes, it’s recommended, but if you don’t do it, your sub-theme will still work.

To update it:
Copy config/schema/solo_subtheme.schema.yml to your sub-theme’s config/schema/subtheme/ directory and rename the file to:

your_new_subtheme_machine_name.schema.yml
Inside the file, change:

solo_subtheme.settings:
  type: mapping
  label: 'Solo sub-theme settings'
  mapping:

to:

your_new_subtheme_machine_name.settings:
  type: mapping
  label: 'Solo sub-theme settings'
  mapping:

Best wishes,
Alaa

You're great, Alaa.
Thank you for the quick response.
If you find the time, could you adapt the file I mentioned in the "Proposed resolution". It will be clear then for everybody.
Here is the link again. →

https://www.drupal.org/docs/extending-drupal/themes/contributed-themes/s... →
Done, thank you!

Great, thank you again.

Sorry to say so, Alaa. But I think there is still an error in the documentation.

Below of the added text for the schema file there is a next step.

Step 8: Update the theme file:

Search for:
"Replace it with $suggestion = str_replace('your_old_theme_machine_name_', 'fun_', $suggestion);"

and replace by
"Replace it with $suggestion = str_replace('solo_', 'fun_', $suggestion);"
Sorry to bother again.
Thank you