https://forum.aspose.com/t/16411
Since the forum is not able to reply,
the cell is still couldn’t edit the whole value at the first time I click on the cell. (Like the control as in MSexcel)
I only be able to start to add character at the end inside the cell.
FYI
If I am not explaining very cleanly, you can use the acwmain.js which from aspose-gridweb-8.6.3 ver(download with offical demo) instead the newest one.
Hope that information is helpful.