Use url_to_postid instead of text comparison for in-reply-to

[singpolyma]

Instead of checking that the in-reply-to links link to the exact permalink of the post the comment is on, I propose instead checking if the post_ID we get from url_to_postid on the in-reply-to link matches the local post_ID -- this would allow for more flexibility for the format of the link on the remote (eg, both ?p= and rewrite forms would work).

[pfefferle]

Great idea!

[dshanske]

This is good, but might cause a fragment issue. Will look

[stale]

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