Add fallback to default skin in plugins + replace links to plugin directory with the real plugin dir

program/include/rcube_template.php

@@ -332,12 +332,18 @@ class rcube_template extends rcube_html_page
     private function parse($name = 'main', $exit = true)
     {
         $skin_path = $this->config['skin_path'];
+        $plugin = false;
         
-	$temp = explode(".", $name, 2);
-	if (count($temp) > 1) {
-	    $path = $this->config['plugins_dir'] . '/' . $temp[0] . '/skins/' . $this->config['skin'] . '/templates/' . $temp[1] . '.html';
-	} else
-	    $path = "$skin_path/templates/$name.html";
+        $temp = explode(".", $name, 2);
+        if (count($temp) > 1) {
+            $plugin = $temp[0];
+            $name = $temp[1];
+            $skin_path = $this->config['plugins_dir'] . '/' . $temp[0] . '/skins/' . $this->config['skin'];
+            if (!is_dir($skin_path))  // fallback to default skin
+                $skin_path = $this->config['plugins_dir'] . '/' . $temp[0] . '/skins/default';
+        }
+        
+        $path = "$skin_path/templates/$name.html";
 
         // read template file
         if (($templ = @file_get_contents($path)) === false) {
@@ -350,6 +356,11 @@ class rcube_template extends rcube_html_page
                 ), true, true);
             return false;
         }
+        
+        // replace all path references to plugins/... with the current plugins dir
+        if ($plugin) {
+          $templ = preg_replace('/\bplugins\//', $this->config['plugins_dir'].'/', $templ);
+        }
 
         // parse for specialtags
         $output = $this->parse_conditions($templ);