Received webmention update with source redirect should update comment link #102
Description
In 3.2.4 Updating existing Webmentions, there needs to be a step to keep track of a source redirect e.g. for a new slug, or updating http to https, and to save and use that new URL instead of the original source in places like linking a received comment back to its original.
(Originally published at: http://tantek.com/2018/308/b1/received-webmention-update-source-redirect)