[Safari] Insert column before/after problematic

[Damian]

To reproduce:

1. Open nightly sample
   
2. Insert table with 3 columns
   
3. Populate the cells in the first row to keep track of them.
   
4. Select and right click in the empty area of a cell in the first row (to the right of the text in the cell)
   
5. Attempt to insert a column before the current column
   

Result is that the column is added to the beginning of the table and not before the selected column