Instead of just unsetting the function assist provider and quick fix
assist provider reset it to the previous provider.
Change-Id: I46c5c2f14234e3da08480dd103e4634859447d57
Reviewed-by: Christian Stenger <christian.stenger@qt.io>
More in line with QFileInfo terminonlogy which appears to be
best-of-breed within Qt.
Change-Id: I1d051ff1c8363ebd4ee56376451df45216c4c9ab
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>