Merge pull request #32 from santigimeno/get_input_focus

Add GetInputFocus request

lib/corereqs.js

@@ -506,6 +506,19 @@ module.exports = {
           return [ 'CCSLL', [42, revertTo, 3, wid, 0] ];
       }
    ],
+   
+   GetInputFocus: [
+       function() {
+           return [ 'CxS', [ 43, 1 ] ];
+       },
+       function(buf, revertTo)
+       {
+           return {
+               focus : buf.unpack('L')[0],
+               revertTo : revertTo
+           };
+       }
+   ],
 
    WarpPointer: [