Symfony version(s) affected: 4.4.16

Description
StringUtil::trim() is doing preg_replace('/^[\pZ\p{Cc}]+|[\pZ\p{Cc}]+$/u', '', $string) to trim strings, however this regex is missing ZERO WIDTH SPACE (\xE2\x80\x8B) characters.

How to reproduce
http://sandbox.onlinephpfunctions.com/code/5b72e8ff76c34a313c0f2799995f56e5993b6b60

Possible Solution

p{Cf} catch

When creating or editing a relationship, we should group the relationship type list with the same tag as on the contact page (Love, Family, Other kind, ...), i.e. with an element.

Under the 'Theme' settings tab you can upload images. It would be great if vector images can be added so it can scale without causing artifacts.

• OctoberCMS Build: 467
• PHP Version: 7.4

We had this code running in one of our plugins for quite a while, see example: https://octobertricks.com/tricks/register-custom-side-navigation-for-your-plugin

We believe it stopped working on v466 update (2 updates ago)

When adding the code line:

<?php

$sideMenuItems = BackendMenu::listSideMenuItems();
print_r($sideMenuItems);