fix in displayNamesInGroup: when specified limit N, we did complex search only in the first N users
change logic in displayNamesInGroup and add some unit tests
add more logic in displayNamesInGroup for big user bases
1. remove sizeof($filteredUsers) > 0 as condition
2. use count instead of sizeof. Latter is an alias to first one, practically we stick to count everywhere. Having it consistent helps with readability.
3. move whitespace so we have $groupUsers[] = $filteredUser; instead of $groupUsers []= $filteredUser;
Merge pull request #9225 from voxsim/fix_displayNamesInGroup

fix in displayNamesInGroup