[regression] lockscreen needs extra key stroke to wakeup before password is accepted

[Jan Prieser]

starting with unity=7.2.0+14.04.20140410-0ubuntu1 the unlocking needs extra key press before accepting the password.

i've tested with 7.2.0+14.04.20140404-0ubuntu1 to confirm the old behaviour:
- lock the screen
- wait until its black
- type your password and hit return

expected behaviour:
- back in session

actual behaviour:
- "wrong password" try again

workaround:
- lock screen
- wait until its black
- press any key
- type password and hit return

so this is a UX regression and very annoying.

last version working 7.2.0+14.04.20140404-0ubuntu1
regression since 7.2.0+14.04.20140410-0ubuntu1