DiffEditor: remove description when the diff is saved.

The description itself isn't saved so no need to
keep it anymore.

Change-Id: I8e521ce261261eb91a1f218f4e65092fc3fb44e8
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>

src/plugins/diffeditor/diffeditordocument.cpp

@@ -85,8 +85,9 @@ bool DiffEditorDocument::save(QString *errorString, const QString &fileName, boo
     if (!ok)
         return false;
 
-    if (m_controller->reloader())
-        m_controller->setReloader(0);
+    m_controller->setReloader(0);
+    m_controller->setDescription(QString());
+    m_controller->setDescriptionEnabled(false);
 
     DiffEditorManager::removeDocument(this);
     const QFileInfo fi(fileName);