[ChangeLog][QtCore][QSaveFile] Member functions such as fileTime() and
size() now continue to work after commit().
Fixes: QTBUG-66605
Fixes: QTBUG-77039
Change-Id: I0b17eae9493911d1a0828b589d762bd8eb344bce
Reviewed-by: Ahmad Samir <a.samirh78@gmail.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>