Do not clear the settings of QHeaderView during layoutChange when the
model is empty and the section count did not change. This will not work
when a section is moved or a section is replaced with a new one during
layoutChange. But since layoutChanged is also called on sorting, this
patch ensures that the settings are not cleared in this case.
This restores the behavior to the same as before 5.9.4.
Task-number: QTBUG-66444
Task-number: QTBUG-65478
Change-Id: I39989cfd45b42e58f49d18ec014d3a941cadb6c9
Reviewed-by: Thorbjørn Lund Martsum <tmartsum@gmail.com>
9395f35cb1