Fix mistake in getScrollInfo

Author: marijnh

lib/codemirror.js

@@ -333,7 +333,7 @@ var CodeMirror = (function() {
       },
       getScrollInfo: function() {
         return {x: scroller.scrollLeft, y: scrollbar.scrollTop,
-                height: scroller.scrollHeight, width: scroller.scrollWidth};
+                height: scrollbar.scrollHeight, width: scroller.scrollWidth};
       },
 
       operation: function(f){return operation(f)();},