Notify user where required elements are nested in IRRE or Tabs
TYPO3 offers the possibility to define fields as "required". If done so, you cannot save a record unless all required fields are filled correctly.
Imagine you're using IRRE with Tabs and create a multilevel scenario with several required fields. If IRRE levels are collapsed or the tab with the required field is not visible - you'll spend some time on searching the field that has to be filled.
The feature request is to notify the user where these unfilled fields are.
Use the attached extension "test_required" to reproduce this behaviour and test further patches for this issue.
(issue imported from #M5899)