click while editing a cell is saving the data and not allowing to edit it

[SurabhiSingh8]

I am trying to add a new row and enter values, while typing if I make a mistake, I try to click in between the characters that I have typed and delete/correct the mistake, its not allowing to edit, instead it saves the row. This behaviour is observed if grid contains large number of rows, if I limit the rows to around 10, its working fine. Here is the plunker-- http://plnkr.co/edit/GL5sz3a3Ue59hP5kgARU?p=preview

steps: 1>click on add, 2> click on set focus, 3>enter sm data, 4>click on entered data