I don't know what happened to the prompt Classic + Git Prompt that Fish used to have in the list of prompts available.
In any case I have another machine using an older version of Fish that it does have it, so I was wondering how I can export it to the newer version and why that prompt got deleted instead of increase the number of prompts in newer versions?
This prompt is still available, but it has been renamed to 'Classic + Vcs' because it now supports git, Mercurial and svn. You should be able to see it in the fish_config
prompt chooser.
You can always see your prompt function by running:
functions fish_prompt
(Note functions, not function)