git status should report when a submodule URL is out of sync

[Denton-L]

This will prompt users to run git submodule sync to bring their URLs up to sync.

[phil-blain]

That's a very good idea!

I guess you mean when submodule.<name>.url in .gitmodules is different than submodule.<name>.url in .git/config and/or from remote.origin.url in .git/modules/<name>/config.

Although we should be careful that this is still useful in more advanced use cases, such as if the user manually changed remote.origin.url in the submodule to point to their own fork, (in which case git submodule sync will overwrite this custom configuration, which is not very useful... I wish there was a submodule.<name>.remote configuration setting in .git/config that would tell git submodule sync which submodule remote url to update!)