positioner: Make sure we check deferMovePositions exist
Checking m_deferMovePositions.count() seems to be always true,
even when its empty.
Make sure we check the size is more than 0 so we don't move items around without any reason to do so.
We also do not emit positionsChanged if we have not even touched the positions,
to avoid deleting old configuration
(cherry picked from commit e82c44ef)
ff93aa2c positioner: Make sure we check deferMovePositions exist 5326625b Only update positions if we have actually touched them
Co-authored-by: Akseli Lahtinen akselmo@akselmo.dev