GUACAMOLE-723: Sort connections in panel by last use.

guacamole/src/main/webapp/app/client/controllers/clientController.js

@@ -492,6 +492,12 @@ angular.module('client').controller('clientController', ['$scope', '$routeParams
 
     });
 
+    // Update last used timestamp when the active client changes
+    $scope.$watch('client', function clientChanged(client) {
+        if (client)
+            client.lastUsed = new Date().getTime();
+    });
+
     // Update page icon when thumbnail changes
     $scope.$watch('client.thumbnail.canvas', function thumbnailChanged(canvas) {
         iconService.setIcons(canvas);