Open-sourcing Sections: Declarative data handling for Litho lists

What this post added

Introduced Sections, a declarative and composable API built on top of Litho, for building highly-optimized list surfaces. Sections abstract away manual adapter management and provide automatic data diffing and granular UI refreshes, leading to significant performance improvements (e.g., 42% scroll performance improvement for the Comments surface). The API supports composition of different data sources and offers support for rendering with traditional Views.