Keyboard fails to move active cell after clicking a column header or row header

[seancolsen]

Steps to reproduce

1. Go to a table page.
2. Click on a cell to select it.
3. Press Up, Down, Left, Right, Tab and Shift+Tab.
4. Observe the active cell to move in response to the keyboard. Good.
5. Click on a column header to select all the cells within the column.
6. Press those keyboard keys again.
7. Expect the active cell to move as before.
8. Instead, observe that the active cell does not move in response to the keyboard.