[RFC] Identify where a Git config is defined

Hi,

Using "git config --list" shows me all configs but sometimes I have a hard time to figure out where a certain config is defined. This is especially true on Windows as I found the system config in various places. I wonder if other people would find it useful to enable something like "git config --list --print-source" where every config value is printed with the file where it originates from.

If I read the source correctly this would mean I would need to change "config_fn_t" to pass not only key and value but also the config source file in addition. Since "config_fn_t" is used in many places this would be a big change that probably is not worth the effort?!

Alternatively I was thinking about "git config --print-source-files" to print all config files that Git would parse. This would already help to find the configs and would probably be a smaller change.

Thoughts?

Thanks,
Lars