fix(mattermost): truncate draft previews on code-point boundaries

clawsweeper[bot] · clawsweeper[bot] · commit 86d0dd2a069e · 2026-06-28T18:08:39.000Z
diff --git a/extensions/mattermost/src/mattermost/draft-stream.test.ts b/extensions/mattermost/src/mattermost/draft-stream.test.ts
@@ -227,6 +227,7 @@ describe("createMattermostDraftStream", () => {
     const sent = message as string;
     // The straddling emoji must be dropped whole, leaving no dangling surrogate half.
     expect(/[\uD800-\uDFFF]/u.test(sent)).toBe(false);
+    expect(sent.length).toBeLessThanOrEqual(12);
     expect(sent).toBe("aaaaaaaa...");
   });
 
