Number Field in a Widget Column Problem

I'm using ExtJS 5.1.0 (commerical release).

This problem only appears to be happening in IE (worked fine in Chrome).

I have a number field in a Widget Column and when you click on the field you can type any characters (i.e. no number keystoke filtering happening).

It appears to be happening because the column cell is focused when you initially click on the number field (instead of the field), but the cursor is in the field so you can type anything. If you slowly click twice to get the field to focus, then it works as expected.

Here is a fiddle of the problem:

http://ift.tt/1I0NyTP

Any help with a workaround would be appreciated.

Thanks.

Number Field in a Widget Column Problem