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Mark VanLandingham ff700ad8c3 DEV: Various changes to support nested posts experiment (#37785) ... This PR adds several reusable pieces to Core that the discourse-nested-replies plugin needs, while keeping them general-purpose enough to be useful to other plugins and future Core work. ## Summary ### TopicMetadata component extraction - Extracts the category chooser, tag chooser, plugin outlets, and save/cancel controls from `topic.gjs` into a standalone `<TopicCategoryTagEditor>` component - The nested-replies plugin reuses this component in its own topic header, avoiding duplication of ~55 lines of template code - No behavioral change to the existing topic page ### Value transformers for URL routing - **`route-to-url`** — applied in `DiscourseURL.routeTo()`, allows plugins to intercept and rewrite navigation URLs before routing occurs. Returns early if the transformer nullifies the path. - **`topic-url-for-post-number`** — applied in `Topic#urlForPostNumber`, allows plugins to rewrite per-post URLs (e.g. for nested views) - **`post-share-url`** ### TopicView `PostDependentCache` concern - Introduces `memoize_for_posts` — a declarative way to register instance variables that should be cleared when posts are replaced - Provides `reset_post_collection(posts:)` — an explicit method for swapping the post collection on a TopicView after initialization, automatically clearing all registered caches - Adds `skip_post_loading` initializer option so plugins that supply their own posts can skip the default post-loading SQL entirely - 4 specs covering replacement, cache clearing, preload hooks, and skip_post_loading --------- Co-authored-by: Isaac Janzen <isaac.janzen@discourse.org>		2026-03-09 15:47:03 -05:00
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post_dependent_cache.rb