* Set the default comment threshold to -8. This means that comments are
hidden at -8 or lower and greyed out at -4 or lower.
* Reset the comment threshold to -8 for anyone with a threshold greater
than -8. For reference, only about ~3100 users had a non-default
threshold. About 1600 of those had their threshold reset to -8.
* Change the comment threshold to a less-than-or-equal comparison
instead of a less-than comparsion. This means that a threshold of 0
before is the same as a threshold of -1 now. Since everyone's
thresholds were reset, this only affects people whose thresholds were
already less than -8, which is so low that the difference shouldn't
matter much.
* Set the maximum comment threshold to 5. For reference, less than 1% of
comments have a score greater than 5.
* Set the minimum comment threshold to -100. For reference, the most
downvoted comment has a score of -60.
Let users see when a post has deleted comments. Show normal users a
'[deleted]' placeholder when a comment is deleted. Show the full comment
to moderators.
Also fix it so that the comment creator can't edit or undelete deleted
comments, and users can't vote on or report deleted comments.
Finally, hide the creator_id, updater_id, and body of deleted comments
in the API.
Previously thresholded comments were hidden completely. You had to click
the "Show X hidden comments" button to unhide all hidden comments in a
thread. Now it works like this:
* When a comment is below your threshold, the comment text is hidden and
replaced by a `[hidden]` link, which you can click to unhide the comment.
* When a comment is at half your threshold (for example, your threshold
is -8 but the comment is at -4), then the comment is greyed out.
This means that comments aren't completely hidden, they're just
collapsed, so you can see the commenter and the score without unhiding
the comment. It also means you don't have to scroll back up to unhide a
comment, and threads aren't disrupted by comments being secretly
hidden (which is confusing when people are replying to hidden comments,
which forces you to go back up and unhide to find).
This refactors Pundit policies to only rely on the current user, not on
the current user and the current HTTP request. In retrospect, it was a
bad idea to include the current request in the Pundit context. It bleeds
out everywhere and there are many contexts (in tests and models) where
we only have the current user, not the current request. The previous
commit got rid of the only two places where we used it.
