[Feat] Favorite Posts from Preview Panel #3
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This makes the preview panel slightly more useful, especially since the heart icon has a hover effect indicating that it should be usable, despite the fact that all it does is send you to the top of the page (Well, at least in firefox)
The way I did this is a wee bit hacky, but it works (Well, at least in firefox... Don't see why it wouldn't work in Chrome)... It however doesn't take into account if the user is logged in already or not, but I imagine danbooru will complain bitterly (or stop working) when the user isn't.
I would have done the same for the Up / Down vote buttons, however the API doesn't provide that information, even the main posts page waits for you try to up / down vote before offering the chance to remove your vote.