Mismatch between the copyright detection in `lint` and `addheader`/`annotate`

[linozen]

When running addheader/annotate on a file that has copyright statement or license expression that is not in the first comment header, the tool should print a warning to the user (because lint parses the entire file, not only the first comment header). The warning should inform the user about this mismatch in copyright detection which might cause confusion when changing copyright later on.

Also, the documentation should probably mention this somewhere.

[nicorikken]

Currently no such check is executed, so some code change is needed in order to print a warning.

[github-actions[bot]]

Thank you for your time and contributions! Unfortunately, this issue has been inactive for quite a while which means we probably can't manage the time to deal with it. That's why we're marking it as stale. We want to keep things tidy and focus on active discussions, but we’re always happy to revisit if this is still relevant!

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[github-actions[bot]]

Since there hasn't been any recent activity after the last message, we're going to go ahead and close this issue. Feel free to reopen this and remove the labels stale and unresolved if it's urgent.

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