Someone else did a CRAZY change.
External test repository
I now change the foreign file.
This is a change done in the host project.
New change in foreign file.
After adding [remote "foreignSubModuleRepo"] url = https://github.com/marpet/foreignSubModule.git fetch = +refs/heads/:refs/remotes/foreignSubModuleRepo/ to .git/config
Changing this as submodule in host project.
Another change in the submodule within the host.