Public bug reported:

I have set up the xfce4-screenshooter to be invoked with the "-r" flag
when pressing the Printscreen button on the keyboard (i almost always
only want to capture a region of the screen).

This works very well, except when the Printscreen button is accidently
pressed a second time before selecting a region.

If this happens, the screen goes even darker and you can't select a
region. Pressing Escape doesn't help either. There is no way to interact
with the desktop.

When switching to a console (e.g. CTRL-ALT-F1) i can see that
xfce4-screenshooter runs multiple times. If i kill those processes, the
desktop becomes usable again.

A possible fix would be to allow only a single instance of the programm
to run.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xfce4-screenshooter 1.8.2-2
ProcVersionSignature: Ubuntu 4.13.0-36.40~16.04.1-generic 4.13.13
Uname: Linux 4.13.0-36-generic x86_64
NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
Date: Tue Mar  6 12:43:31 2018
InstallationDate: Installed on 2018-01-10 (55 days ago)
InstallationMedia: Xubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
SourcePackage: xfce4-screenshooter
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: xfce4-screenshooter (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug xenial xubuntu-exp

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  Multiple invocatrions of screenshooter in "region" mode block desktop

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