[BUG] discover / trending screen skips content when new content loads

[clhenrick]

Is there an existing issue for this?

• [x] I have searched the issues (both open and closed)

Current Behavior

When scrolling through the discover / trending screen (the option with the magnifying glass in bottom toolbar), content often loads and then unexpectedly / automatically scrolls to a post further down the timeline. Needless to say this behavior is somewhat crazy making as when looking at a post and starting to read it the entire timeline shifts rapidly and dramatically. This behavior doesn't seem to happen on the home screen. I've been noticing this behavior for the past 3-4 months when using the Mastodon for iOS app. I've included a screen recording to show the behavior.

Expected Behavior

Scrolling the discover / trending content should behave the same as scrolling content on the home screen and shouldn't jump ahead by multiple posts unexpectedly.

Steps To Reproduce

1. Go to the trending / discover content
2. Begin to scroll to view more posts
3. Notice that the scroll position will jump dramatically and unexpectedly
4. It seems to happen when posts load that contain images

Environment

- Device: iPhone SE
- OS: iOS
- Version: v18.3.2
- Build: Mastodon for iOS v2025.01 (7114)

Anything else?

https://github.com/user-attachments/assets/a3b7352b-269a-4a67-b657-152164dfd7a8