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Background: when question is migrated from site A to site B and the author doesn't have account in site B, he will appear "gray" until he logs in to site B and associate the accounts, then the avatar show and all is good. No problems here, same for answers and their authors.

Problem: if user from site A posted comments while the question was still in site A, his name will stay gray and unclickable even after he logs in and have account in site B:

screenshot

This is the above question, but most likely it's global problem, not specific to that one occurrence.

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Nick already answered this elsewhere on meta, but basically comments don't contain enough user information for us to reliably map them in all situations. –  Jeff Atwood Feb 21 '12 at 9:18
1  
@Jeff thanks, didn't see such answer. Isn't there user ID associated with each comment? Just the raw display name? –  Shadow Wizard Feb 21 '12 at 9:23

1 Answer 1

up vote 8 down vote accepted
+100

Here's the answer Jeff's referring to on why this doesn't happen currently:
Comments by OP on migrated question become "anonymous"

We may revisit hooking up comments in the future, but it's not a completely trivial problem (e.g. should reply to hook up as well? that's more info that needs carrying over), and won't/can't be retroactive. That being said, I do have an idea on how to take care of this in a not terribly expensive way, I'll throw it out to the team and see if it's worth it.

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Cheers, good luck with that idea of yours - hope it will be accepted and implemented. :) –  Shadow Wizard Feb 21 '12 at 11:13
    
At the very least, could commenters be notified in some non-expensive way that the question is being or has been migrated? –  Aaron Bertrand Nov 12 '13 at 21:27

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