Steps to reproduce:
1. launch Hello ListView
2. select Row 6 (it creates anchor)
3. navigate to Row 8 by CTRL-DOWN
4. select Row 8 by CTRL-SPACE (creates new anchor, anchor from Row 6 is removed)
5. navigate to Row 10 by pressing CTRL-DOWN
6. select Row 10 by CTRL-SPACE (creates new anchor, anchor from Row 8 is removed)
7. navigate to Row 8 by pressing CTRL-UP
8. deselect Row 8 by CTRL-SPACE (creates new anchor, anchor from Row 10 is removed)
9. navigate to Row 14 by CTRL-DOWN
10. press SHIFT-SPACE to create continuous selection

EXPECTED RESULT: items 8-14 should become selected
 
Now try the same steps again, but in step #9 press SHIFT-DOWN instead of SHIFT-SPACE. You'll see that items 8-15 are selected (which is correct), so I don't know why SHIFT-SPACE does not work.