Improved the internal session handel of JCB. Fixed gh-487 that removed the data size when creating a new field.

admin/layouts/server/linked_components_fullwidth.php

@@ -84,6 +84,11 @@ else
 				- <?php echo $this->escape($item->component_version); ?>
 			</div>
 			<?php
+				// always make sure the $this->return_here is set
+				if (!isset($this->return_here))
+				{
+					$this->return_here = urlencode(base64_encode((string) JUri::getInstance()));
+				}
 				// setup the buttons
 				if (!isset($_buttons) || !ComponentbuilderHelper::checkArray($_buttons))
 				{