I try:
- search for (find) a long list of files and folders
- go to position 20 or so
- sort (say by size) so the selected line moves
- press Shift+Down to add the next line to the selection
The selection now starts at the former selected position!
If I press Down, Up first and then walk using Shift, everything works like expected: it resets the position.
A similar situation has been worked around before.