IndexAt() of ListView fails with QSortFilterProxyModel enabled

[Deqing]

I'm using QSortFilterProxyModel to provide filtered result via a list view.

The indexAt() of list view is working as expected before I pass any string into the QSortFilterProxyModel (i.e. by setFilterFixedString).

However, after I passed a string to filter, the indexAt() of ListView will get mess value, returns -1 for the most of the time. Even after I removed the whole string for filtering(displaying all the data), the function still not working.

Can anyone help? Many thanks!