QListView generates a move, when an item is dropped directly behind
itself. This causes unexpected behavior, e.g. item widgets getting
discarded.
This patch prevents a move from being generated in that case.
It adds an autotest to tst_QWidget, to verify item widgets and item
data do not get discarded in case of a no-op drag&drop.
Fixes: QTBUG-100128
Pick-to: 6.5 6.2
Change-Id: I02a755320a7b71dad218293c9c94c88da6507423
Reviewed-by: Jan Arve Sæther <jan-arve.saether@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
a815c40e73