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## Problem Sentry [SUPABASE-APP-J7C](https://supabase.sentry.io/issues/7492405004) — `Error: Node with id=new-folder doesn't exist in the tree.` (328 events / 280 users). Crashes the SQL editor. ## Root cause `react-accessible-treeview` throws when an id is dropped from the controlled `expandedIds` prop in the same render its node leaves the tree data — its collapse effect calls `getTreeNode(data, id)` on a node that's already gone. The prior fix (`8bcb878a01`) reactively filtered `expandedIds` against the live tree, which is exactly what produces that simultaneous drop when a `new-folder` placeholder (or any expanded folder) is removed. ## Fix - Guard additions: only expand folder ids that exist in the tree. - Tolerate stale ids: pass `expandedFolderIds` as-is instead of the reactively filtered list, so we never create a "removed" delta for a node that's already gone. Stale ids are harmless — the library only inspects the add/remove delta. ## Reproduction (to verify the fix) 1. Open the SQL Editor for a project. 2. Create a folder and add a snippet into it. 3. **Expand** the folder. 4. Right-click the folder → **Delete folder** (confirm). 5. Before: the editor crashes with `Node with id=... doesn't exist in the tree.` After: no crash. Fixes SUPABASE-APP-J7C <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **Bug Fixes** * Improved stability of private snippet folder expansion in the SQL editor: auto-expansion now respects the current snippet tree state to avoid unexpected collapses or visual glitches in the folder tree. <!-- end of auto-generated comment: release notes by coderabbit.ai -->