Added ability to set temporary admin messages

classes/admin.php

@@ -107,6 +107,11 @@ class Admin
      */
     protected $loading_additional_files_in_background = false;
 
+    /**
+     * @var array
+     */
+    protected $temp_messages = [];
+
     /**
      * Constructor.
      *
@@ -402,6 +407,16 @@ class Admin
         $messages->add($msg, $type);
     }
 
+    public function addTempMessage($msg, $type)
+    {
+        $this->temp_messages[] = ['message' => $msg, 'scope' => $type];
+    }
+
+    public function getTempMessages()
+    {
+        return $this->temp_messages;
+    }
+
     /**
      * Translate a string to the user-defined language
      *