Add Cascade to placement policy

Author: johanmalm

src/maindialog.cpp

@@ -89,7 +89,7 @@ void MainDialog::activate()
     ui->dropShadows->setCurrentIndex(xml_get_bool_text("/labwc_config/theme/dropShadows"));
 
     /* # BEHAVIOUR */
-    std::vector policies = { "", "Center", "Automatic", "Cursor" };
+    std::vector policies = { "", "Automatic", "Cascade", "Center", "Cursor" };
     active = -1;
     active_id = xml_get("/labwc_config/placement/policy");
     int i = 0;