Basic Issue: enableCellEditOnFocus only works every other time, even in Tutorial

When using enableCellEditOnFocus, it only works every other click.

Here is a modified Plunkr of Tutorial: 201 Edit Feature: http://plnkr.co/edit/KkrTaTQJGtgQGsc6WrB3?p=preview

Click on a cell in the Name column: you can edit it. Click on another cell in the Name column: it just selects the cell, does not bring up an editor. Repeat.

This problem was introduced in v4.0.8. It's quite a severe problem, apparently rendering enableCellEditOnFocus somewhat unusable. I hope this can be fixed: otherwise I can't take any of the many improvements since then.