Responding to negative behaviour tends to solicit more of the same. Common wisdom states: "don't feed the trolls".
This change codifies that advice by introducing a new nudge when hitting the reply button on a flagged post. It will be shown if either the current user, or two other users (configurable via a site setting) have flagged the post.
When using the "review media unless trust level" setting, posts with emojis or quotes will end up in the review queue even though they don't have any uploaded media. That is because our heuristic for this in the new post manager relies on image_sizes. This commit skips sending image_sizes for emojis and avatars.
Co-authored-by: Régis Hanol <regis@hanol.fr>
