Check whether `$arrParentIds` is empty in `Controller::getChildRecords()`
Make sure there is an array in `Controller::generateMargin()` (see #5217)
Added the Extension Repository formatting enhancements
Replaced the 1200 pixel limit when resizing images with the values defined in the system settings (see #5268)
Anonymize IP addresses in `Form::processFormData()` (see #5255)
Do not group standalone lightbox elements on HTML5 pages (see #3742)