message: Make user autocomplete query search beyond prefix
diff: @@ -56,7 +56,7 @@ export default class UserProvider extends AutocompleteProvider {
  this.matcher = new QueryMatcher([], {
  keys: ['name'],
  funcs: [obj => obj.userId.slice(1)], // index by user id minus the leading '@'
  - shouldMatchPrefix: true,
  + shouldMatchPrefix: false,
  shouldMatchWordsOnly: false,
  });
  