Steps to reproduce:
1. Launch HelloTableView app and select Multiple Cells mode
2. Select e.g. a cell in the last column
3. Press e.g. SHIFT + LEFT as many times as you want
4. Once desired cells are selected, try to deselect them by SHIFT + RIGHT

RESULT: For steps above, the most left selected cell stays selected
EXPECTED RESLT: The most left selected cell should become deselected.