LightDM looses focus

[Salem]

Sometimes after I wake up from suspend, LightDM seems to lost focus to a window in the desktop.
I have a blinking cursor in the LightDM screen, and if I start typing anything the cursor doesn't move, and the only way to bypass this is wait the screen to turn off and on again (here I can type the password).
This also happens when locking the screen.

Description: Ubuntu 14.04.1 LTS
Release: 14.04

Lightdm version: 1.10.1-0ubuntu1

How to reproduce:
* Open a window and click on a text box (ex: login form in some web page in a browser).
* Lock the screen
* Try to type your password to unlock it: the cursor blinks but doesn't move at all;
* Wait for the screen to turn off, do something to wake up the screen and login;
* Whatever you typed will be on the text input of the window you had focus (in this example: the login form of the web page)

What was supposed to happen:
* After locking the screen or waking from suspend, I expected that typing my password would unlock the screen.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[João Assad (jfassad)]

As a workaround If you click on one of the indicators and click back on the password field you can type your password right away.

[João Assad (jfassad)]

This bug could also expose your password to someone looking over your shoulder when you unlock your desktop.