This directory contains the data structures, interfaces, and in-memory storage for cross platform tab code. As of March 2025 the desktop tab collection code is being migrated to this directory to be shared with other platforms.
TabCollections are n-ary tree data structures that host a mix of tabs and other tab collections. These collections represent logical groupings of tabs such as pinned tabs, tab groups, etc. Tabs in tab collections are represented by platform agnostic TabInterface.
The goal of tab collections is to replace the legacy list-based approach to storing tabs which was error-prone and could result in various bugs such as noncontiguous tabs being in a tab group, pinned tabs being in tab groups, etc.