Issue Description

Behaviour:
I have a category expanded and the first sub item is selected + corresponding view will be displayed in the content area.

When I click on the category header (not the arrow) and the header click doesn't trigger any navigation event, which means view in content area represents sub item, the focus will be changed to category header and the category does not collapse.

Expected:
I would expect that the category would collapse and focus will stay on the sub-item, when I click on the category name.
e.g. like here:
https://fiddle.luigi-project.io/#/home/overview

UI5 Web Components Version
2.4.0