Fix possibly incorrect rendering on Windows (proxy used when they shouldn't)

CCBUG: 429905

src/dialogs/renderwidget.cpp

@@ -1294,7 +1294,7 @@ void RenderWidget::prepareRendering(bool delayedRendering, const QString &chapte
         }
 
         // replace proxy clips with originals
-        QMap<QString, QString> proxies = pCore->projectItemModel()->getProxies(pCore->currentDoc()->documentRoot());
+        QMap<QString, QString> proxies = pCore->projectItemModel()->getProxies(root);
 
         QDomNodeList producers = doc.elementsByTagName(QStringLiteral("producer"));
         QString producerResource;

src/doc/kdenlivedoc.cpp

@@ -1299,7 +1299,7 @@ void KdenliveDoc::loadDocumentProperties()
     QDomElement baseElement = m_document.documentElement();
     m_documentRoot = baseElement.attribute(QStringLiteral("root"));
     if (!m_documentRoot.isEmpty()) {
-        m_documentRoot = QDir::cleanPath(m_documentRoot) + QDir::separator();
+        m_documentRoot = QDir::cleanPath(m_documentRoot) + QLatin1Char('/');
     }
     if (!list.isEmpty()) {
         QDomElement pl = list.at(0).toElement();