Comment 30 for bug 778256

Omer kindly put the patch under review so the ball is rolling.

In case you want to have this fix asap I uploaded the latest Unity with this patch included into my ppa: ppa:mjuhasz/backports
It also includes the fix for bug #754565 (Shift+click on a launcher icon to open a new application instance) but otherwise it's the same as the Unity 4.28 currently in proposed. Feel free to install and enjoy it until this fix officially lands in the repositories.