spring moves application windows off visible screen area after leaving full screen mode on unity

[Karl-Philipp Richter]

`spring` moves application windows off visible screen area after leaving full screen mode on `unity`. Windows have to be dragged back following http://stackoverflow.com/questions/12477435/window-appears-off-screen-on-ubuntu. This happens randomly for windows initially, but if they have been moved once they're moved every time `spring` is started and quit again.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: spring 100.0+dfsg-2build1
Uname: Linux 4.5.5-040505-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Jun 5 21:23:22 2016
InstallationDate: Installed on 2013-10-17 (962 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
SourcePackage: spring
UpgradeStatus: Upgraded to xenial on 2016-03-04 (92 days ago)