ListView::header doing anything during construction to affect ListVIew::model will likely crash and burn

Picture the case where you have a C++ model in a ListView, and a header component on that ListView.

Your header component sets a property, say a filter on the model during construction of the header component. Now, QML will go crash itself because it tries to create delegates while it's still constructing the header.

A similar issue likely exists with ListView's footer too.