Locked cells, inserting blanks

I have noticed that when a cell is locked, and you press keys, it inserts a blank in the cell before the text, and there is not a way to undo it. Is there a way to really make the cell locked? so it does not insert blanks for every keystroke pressed?

This occurs even in the demo
http://dhtmlx.com/docs/products/dhtmlxSpreadsheet/index.shtml

put a value in the cell, then lock it. after its locked select the cell and start pressing keys, you will see blanks inserted in the cell

Thanks
Rick

Hi,
problem is confirmed.
To fix it please update file codebase/dhtmlxsh_keys.js from attachment.
Thanks for your feedback.
dhtmlxsh_keys.zip (1.28 KB)

Thanks for the quick response and fix.

Rick