Patch 2.5.1/API changes

The Burning Crusade Classic 2.5.1 API is a hybrid. Some systems continue from the Classic branch (1.13.2 / 1.13.7), adjusted as required for The Burning Crusade, while other systems are rebased from Shadowlands (9.0.1 / 9.0.5). There is also co-development of new features with the next Shadowlands content patch (9.1.0).

Summary

 * TOC:, and may be written in   or fall back to   (see TOC format).
 * From Classic Era, addons may require BackdropTemplate on frames similar to patch 9.0.1 (see 9.0.1 Backdrop System Changes).