Bug: Updating grid data array while in cell edit mode results in incorrect cell being edited

[karlkerem]

What's wrong:
When user is editing a cell and the underlying grid data array is updated by adding or removing rows, the edit mode is shifted to incorrect cell.

How to repeat:
See Plunker

Expected behavior:
a: Stop edit mode when number of rows is changed while a cell is in edit mode.
(potentially easier to implement(?), but not ideal UX)
b: Keep edit mode on correct cell.