pcmanfm right click empty space shows broken inversert selection in context menu

To reproduce make sure that you are not using the openbox menu when using the second mouse click to bring up a menu on the desktop. To do this run pcmanfm --desktop-pref make the box for show menus provided by window managers when desktop is clicked is not selected. The right click on an empty part of the desktop with no icon when pcmanfm is used to draw the desktop.

I have found this on lubuntu xenial. I did not really expect this to be an option or for it to exist anyway. I mean the only real way for inverse selection. However this would basically become a redunandt version of the select all button if it did work. So does this need removing?

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: pcmanfm 1.2.3-1.1
ProcVersionSignature: Ubuntu 4.4.0-4.19-generic 4.4.1
Uname: Linux 4.4.0-4-generic x86_64
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
Config_pcmanfm_System_Lubuntu: Error: [Errno 2] No such file or directory: '/etc/xdg/pcmanfm/Lubuntu/lubuntu.conf'
CurrentDesktop: LXDE
Date: Sat Feb 20 22:14:58 2016
InstallationDate: Installed on 2015-11-17 (96 days ago)
InstallationMedia: Lubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20151116)
SourcePackage: pcmanfm
Udisks_dump: Error: [Errno 2] No such file or directory: 'udisks'
UpgradeStatus: No upgrade log present (probably fresh install)