Backspace deletes 2 characters in login password when locked

[GoogleCodeExporter]

[ Before posting bugs, please check
https://code.google.com/p/hackerskeyboard/wiki/FrequentlyAskedQuestions and
the existing bugs for known issues - my responses may be delayed since I
have very little time to work on this project. ]

What steps will reproduce the problem?
1. Go to Settings, Security, and set the lock type to password, and set a 
password.
2. Lock your phone/tablet, so the password prompt appears.
3.Type two characters, and then backspace.

What is the expected behavior? What do you see instead?
I expect to delete 1 character when I backspace. Instead, 2 characters are 
deleted.

What version of Hacker's Keyboard are you using, for example "1.37"? (See
"Debug" section at the bottom of the app's Settings menu.)
1.37.1419

On what phone or tablet?
iRULU x7

If applicable, does this affect the 4-row or 5-row layout, or both? Which
language(s)?
5-row and 4 row, english
Please provide any additional information below.

Original issue reported on code.google.com by [email protected] on 22 Feb 2015 at 3:46