Fix post view crosspost display

[alectrocute]

Hi Lemdevs!

Currently, the crosspost UI is displaying for all posts even if the post isn't crossposted.

I propose we:

• Filter out all crossposts with the same community ID as the current PostView.
• If there's a better way to do this, I propose we do that.

Resolves #1394.

Thanks all!

[jsit]

Where is the value of crossPosts coming from? Shouldn't that just be an empty array to begin with? Or is it supposed to be an array of all Communities the link is posted in? Isn't this a new problem? What changed to cause it?

[dessalines]

Using the pv.post.id is better here, because a single post could have some historical cross-posts. For example, a github project might be posted multiple times over the course of a few years.

[dessalines]

@jsit You're correct, this is also a bug in the back end. I'll get a PR out for that shortly.

[jsit]

You're correct, this is also a bug in the back end. I'll get a PR out for that shortly.

Thanks. Maybe best then, @alectrocute, to add a TODO line explaining that this check can be removed at some point, with a link to this comment.

[dessalines]

Actually you can probably close this one, I'll have a back-end fix for it shortly anyway.

[dessalines]

mmk ya I finished the back-end PR, we can close.