QSortFilterProxyModel: Stable sort broken on dataChanged()

When setDynamicSortFilter() is set to true, then QSortFilterProxyModel resorts incorrectly when data changes on roles that are not the sort role. Changing any other role should not change the sort order.

Take for example a two column table where DisplayRole is the
sort role:
a | 0
b | 1
b | 2
b | 3
z | 4

If the row "b|2" changes it's color for some reason it is removed from the table and then re-inserted as a new row. This causes the row to go below it's "like" rows and the arragement is changed to:

a | 0
b | 1
b | 3
b | 2 (this row incorrectly moved)
z | 4