Require at least 2 characters before showing autosuggestions (#5065)

app/javascript/mastodon/components/autosuggest_textarea.js

@@ -20,7 +20,7 @@ const textAtCursorMatchesToken = (str, caretPosition) => {
     word = str.slice(left, right + caretPosition);
   }
 
-  if (!word || word.trim().length < 2 || ['@', ':'].indexOf(word[0]) === -1) {
+  if (!word || word.trim().length < 3 || ['@', ':'].indexOf(word[0]) === -1) {
     return [null, null];
   }