Ability to create cross-posts from app bar button

[micahmo]

Pull Request Description

This PR adds the ability to create a new cross-post from the app bar menu. This is needed because, although the CrossPosts widget has a button for that, it is only displayed if the post is already a cross-post. This new menu item will allow the function to be accessed regardless of the state of the current post.

I decided to add this to an overflow menu rather than directly on the app bar because I figured we'd have more buttons soon!

Issue Being Fixed

Issue Number: N/A

Screenshots / Recordings

qemu-system-x86_64_qILo6mFAWO.mp4

Checklist

• Did you update CHANGELOG.md?
• Did you use localized strings where applicable?
• Did you add semanticLabels where applicable for accessibility?

[hjiangsu]

Thanks for getting to this! I do have one point for discussion, mainly on how cross-posts work on Lemmy.

It looks like we're only handling the case where cross-posts can be created for links/images. I believe we can also create cross-posts for text posts. In this case, the post body gets copied over and is placed into a block quote markdown. We can do something similar in this case, or just copy that over without any changes.

This is an example of a text cross-post: https://lemmy.world/post/10508184

[micahmo]

Sure, we can support creating cross-posts from text posts! My only concern is that it's not a "real" cross-post in the sense that Lemmy has no knowledge of the original post nor any linkage between them.

I like the example you gave. Do you think we should follow it exactly? Like this?

---

Cross-posted from: <original post link>

<original text>

[hjiangsu]

My only concern is that it's not a "real" cross-post in the sense that Lemmy has no knowledge of the original post nor any linkage between them.

I agree, but I still think we should try to match parity with what Lemmy UI does!

Do you think we should follow it exactly? Like this?

I think thats fine!

[micahmo]

All set!

qemu-system-x86_64_VlHSGa2P3e.mp4

[hjiangsu]

Looks good now. Thanks for doing that!