Shift key inserts extra unwanted character

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Close keyboard by swiping down.
2. Click to bring up the keyboard for typing.
3. When the shift key is FIRST pressed an unwanted character is inserted. 
(whether it is the first key pressed or later on in the text entry)

What is the expected behavior? What do you see instead?
The shift key by itself should not enter a character.
It can be a repeat of the last letter entered, or the last letter passed when 
last closing by swiping down.
It only happens once i.e. for the first press of the shift key, and then only 
if the keyboard was previously closed by swiping. Subsequent use of the shift 
key is normal for that typing session.

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.)
It happens in version 1.37 (tried 1.33 and had the same problem too)

On what phone or tablet?
Samsung Galaxy Tab S 10.5

If applicable, does this affect the 4-row or 5-row layout, or both? Which
language(s)?
It affects both 4 and 5 row layouts (English language)

Please provide any additional information below.
It seems as if a character is sitting on a "clipboard" and is inserted with the 
first shift key press.
It causes passwords to be rejected as invalid if they require the use of the 
shift key. It happens with the default Hackers Keyboard settings.
I don't think I ever had the problem on an older Asus tablet.
Thanks

Original issue reported on code.google.com by [email protected] on 10 Jun 2015 at 8:47