Slop now outputs the root window ID when no window is selected.

CMakeLists.txt

 project( "slop" )
 set( slop_VERSION_MAJOR 3 )
 set( slop_VERSION_MINOR 1 )
-set( slop_VERSION_PATCH 14 )
+set( slop_VERSION_PATCH 15 )
 
 set( BIN_TARGET     "${PROJECT_NAME}" )
 set( CMAKE_INSTALL_PREFIX "/usr/bin" )

README.md

 help
 ----
 ```text
-slop v3.1.14
+slop v3.1.15
 
 Copyright (C) 2014 Dalton Nell, Slop Contributors
 (https://github.com/naelstrof/slop/graphs/contributors)

src/main.cpp

                 h = selection->m_height;
                 // Delete the rectangle, which will remove it from the screen.
                 delete selection;
+                // Make sure if no window was specifically specified, that we output the root window.
+                Window temp = window;
+                if ( temp == None ) {
+                    temp = xengine->m_root;
+                }
                 // Print the selection :)
-                printSelection( format, false, x, y, w, h, window );
+                printSelection( format, false, x, y, w, h, temp );
                 break;
             }
         }