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074561233e
**Category:** fix **User Impact:** Users can insert mentions earlier in a draft and continue typing without the caret corrupting the rest of the message. **Problem:** Caret correction ran after every document change, so typing a mention before existing text repeatedly advanced across the mention separator and interleaved spaces into the draft. **Solution:** Limit correction to the autocomplete settlement it was designed for, with transaction-level and browser-level regression coverage for known and unregistered mentions. <details> <summary>File changes</summary> **desktop/src/features/messages/lib/mentionHighlightExtension.ts** Restricts trailing-space caret advancement to an armed autocomplete settlement instead of every document change. **desktop/src/features/messages/lib/mentionHighlightExtension.test.mjs** Exercises the real ProseMirror plugin state and verifies mid-draft mention typing, unknown tokens, end-of-message typing, and completed-mention separators. **desktop/tests/e2e/mentions.spec.ts** Reproduces the reported composer workflow in Chromium and covers the same corruption path for an unregistered `@token`. </details> ## Reproduction steps 1. Open a channel and enter `hello world` in the composer. 2. Move the caret between `hello` and ` world`. 3. Type ` @bo`, select `bob` from autocomplete, and continue typing `abc`. 4. Confirm the composer reads `hello @bob abc world` with the caret after `abc`. 5. Repeat with an unregistered token such as ` @zzq` and confirm the existing text remains intact. ## Before / After | Before | After | | --- | --- | | Typing after a mid-draft mention walks the caret through the existing message. | Continued typing stays after the inserted mention. | |  |  | --------- Signed-off-by: Taylor Ho <taylorkmho@gmail.com> Co-authored-by: Mongo <5398c5fd039b963ce132b3e078e7c4af097dd997517bb5e14c2682fe68c25197@buzz.block.builderlab.xyz>
