Hello 
This theme component is activate sticky avatars for mobile.
I reused the core sticky avatars feature to make it useable on mobile.
The whole section (topic avatar + topic meta data) is sticky to top. If the post height is out of screen long or if scrolling up on long posts. I removed the sticky avatar for short posts when scrolling up so it will only activate on long posts on mobile.
I disabled this feature on personal messages with some css overwrite.
Because on the sticky section I set up a background color var(--secondary), I moved the topic post highlight from .topic-post to .topic-post .contents so only the section below avatar and meta data will highlighted. 
On this post only the contents section is highlighted.
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Repository | GitHub - VaperinaDEV/discourse-mobile-sticky-avatars: Sticky Avatars for Mobile |
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