Add I301 check, for TYPE_CHECKING too far from previous import #217
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Follow-up to suggested new check in #214 (comment). Thanks to the testing framework already in place, I'm reasonably confident that this has no unintended side-effects. 😁
The new code
I301covers both "too many newlines" and "non-import stuff between the other imports and TYPE_CHECKING" cases. (This way was cleaner than trying to keep track of theprevious_non_importnode, which would complicate the iterator.)