make the undo dialog closable

git-svn-id: http://google-refine.googlecode.com/svn/trunk@371 7d457c2a-affb-35e4-300a-418c747d4874

src/main/webapp/scripts/project/process-widget.js

@@ -61,12 +61,13 @@ ProcessWidget.prototype.showUndo = function(historyEntry) {
     this._div.empty().show().html(
         '<div class="process-panel-inner"><div class="process-panel-undo">' +
             '<a href="javascript:{}" bind="undo">Undo</a> <span bind="description"></span>' +
-        '</div></div>'
+        '</div><div style="text-align: right; padding-right: 1em;"><a href="javascript:{}" bind="close">close</a></div></div>'
     );
     var elmts = DOM.bind(this._div);
     
     elmts.description.text(historyEntry.description);
     elmts.undo.click(function() { self.undo() });
+    elmts.close.click(function() { $(".process-panel-inner").hide() });
 };
 
 ProcessWidget.prototype.undo = function() {