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## Issue I would send a message in the thread side pane and the main chat's composer would then open its at-mention completion UI: https://github.com/user-attachments/assets/25e79e05-8672-4f6e-b5cc-81a46638f229 ## Summary - Render inline composer autocomplete only for the focused rich-text editor. - Preserve editor focus when opening composer-owned mention controls. - Add an end-to-end regression for sending in a side thread while the main composer retains an agent mention. ## Root cause The main channel composer and thread composer share the channel sending state. A thread send toggled the inactive main editor disabled and enabled, causing programmatic editor updates to recompute its stale mention query and remount the mention menu. ## Verification - Desktop unit suite: 5,556 passed - Persistent agent audience E2E spec: 18 passed - TypeScript typecheck - Vite E2E build - Biome and repository text/pubkey/file-size ratchets --------- Signed-off-by: Matt Toohey <contact@matttoohey.com> Co-authored-by: Jitter <2b2e6415e748c35180847a37aadae06a11e30dddc76b784e7fd9354c4eb42e7a@buzz.block.builderlab.xyz> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>