Focus is on the app behind the lock screen after resume from suspend

[Pedro Côrte-Real]

Recently, when I resume from suspend I often can't input anything into the password field. After selecting an icon in the top left corner of the screen lock and then selecting the password field again I can type my password and unlock the computer. Once I do that whatever I typed in the password field actually shows up in whatever app had focus before I suspended, potentially leaking my password to a remote attacker if the focused app is a browser, as it often is.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: lightdm 1.10.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Jul 29 23:51:33 2014
InstallationDate: Installed on 2014-05-03 (87 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
LightdmConfig:
 [SeatDefaults]
 autologin-guest=false
 autologin-user=pedrocr
 autologin-user-timeout=0
 autologin-session=lightdm-autologin
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)