Add support for managing uploaded media

[micahmo]

Pull Request Description

This PR adds the ability to delete uploaded images. There is a new section under account settings for managing media. Navigating to this new page will display all uploaded images with the option to delete any of them. This is only supported for instances running >= 0.19.4.

See: thunder-app/lemmy_api_client#21.

Screenshots / Recordings

manage-media-demo.mp4

---

P.S. While working on this feature, I discovered something really interesting! I've always been annoyed at how seemingly quickly our image caches reset despite having the new aggressive image caching setting. It turns out that this is less about image caching and more about widget caching. The default behavior of SliverLists is to pretty aggressive dispose and rebuild widgets as they're scrolled off/on screen, and this naturally causes some loading artifacts, even for cached images. However, this trick seems to make things much better.

Pass these paramters to the SliverList.

addSemanticIndexes: false,
addAutomaticKeepAlives: false,
addRepaintBoundaries: false,

And then wrap whatever is the root widget in the list with a KeepAlive(keepAlive: true).

For now I've only done it here, but maybe we could consider doing this in other places of the app (respecting the aggressive image caching option). Here's a before/after of just that difference.

Before

scroll-reload-before.mp4

After

scroll-reload-after.mp4

[micahmo]

I decided to add on a slight improvement to this feature. I added the ability to search for usages of the media link. It can help you to decide whether you really want to delete it. It should return cases where the link appears as the URL of a post, in the body of a post, or in the body of a comment. Of course, this method is not foolproof, as the link could be used in some other way (including not even on Lemmy). But it should at least help the user to make a more informed decision.

qemu-system-x86_64_TahRys0qlj.mp4

[micahmo]

@hjiangsu Would you be able to give me a hand figuring out why the tests are failing here? They're saying something about not finding freezed. But I didn't remove that package from the pubspec here, nor in the corresponding change in the API repo. So I'm a bit stuck! 😊

[hjiangsu]

Hmm, not entirely sure what's causing the failures. I glanced at the CI logs and did see this: https://github.com/thunder-app/thunder/actions/runs/9664871877/job/26661495345?pr=1323#step:5:170

I'm not sure if this is what's causing the subsequent failures, but it could be something!

[micahmo]

I saw that too, which is what made me think I removed it by accident, but I didn't. 😆 Maybe I should just add it?

[micahmo]

Maybe I should just add it?

Ok that seems to have worked! It really just changed the reference type in the pubspec.lock from transitive to direct main.

Now it's failing at the linting step, despite apparently not showing any errors (only info/warning). Lol!

EDIT: Nevermind, I see the error. Not sure why I'm not getting it locally.

https://github.com/thunder-app/thunder/actions/runs/9666355363/job/26665643096?pr=1323#step:10:198

[micahmo]

Finally got this building! 😌