Select Window Not Working -- Unhandled Exception in Callback

[misterich]

## Steps to Reproduce
1. Start shutter from terminal ( `$ shutter `)
2. Click toolbar button "Select window with your mouse"
3. Click an open window

You should observe that:

- Shutter seems to do nothing -- but will not allow additional screenshots to be taken
- The following warning appears in the terminal:

$ shutter

    Xlib: extension "RANDR" missing on display ":0.0".
    WARNING: Net::DBus::GLib is missing --> Ubuntu One support will be disabled!
    WARNING: Image::ExifTool is missing --> Writing Exif information will be disabled!
    Warning: undef is not of type Gtk2::Gdk::Colormap at
        /usr/share/shutter/resources/modules/Shutter/App/ShutterNotification.pm line 51.
    INFO: DBus connection to org.freedesktop.compiz failed --> skipping compiz related tasks
    org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.compiz was not provided by any .service files
    *** unhandled exception in callback:
    *** undef is not of type Gtk2::Gdk::Colormap at /usr/share/shutter/resources/modules/Shutter/Screenshot/Window.pm line 81.
    *** ignoring at /usr/bin/shutter line 2902.

## Enviornment Details
$ uname -opr

    3.2.0-26-generic x86_64 GNU/Linux

$ lsb_release -a

    No LSB modules are available.
    Distributor ID: Ubuntu (Xubuntu)
    Description: Ubuntu 12.04 LTS
    Release: 12.04
    Codename: precise

$ shutter --version

    0.88.3 Rev.1206

** `/etc/X11/xorg.conf` and `~/.shutter/settings.xml` attached**

[Tomáš Heger (theger)]

Is there a workaround for this bug? I tried to use the Window option for the first time but it seems strange that it apparently doesn't work since 2012.