QmlDesigner.Rewriter: Clear the cache at every qml load

Already cached items from a possible wrong
environment(kit, default kit, ...) have to be cleared.

Change-Id: Ibd0643a8508b791aa22e0197f7bed6cc9c521066
Reviewed-by: Tim Jenssen <tim.jenssen@theqtcompany.com>

src/plugins/qmldesigner/designercore/model/texttomodelmerger.cpp

@@ -862,7 +862,9 @@ void TextToModelMerger::setupUsedImports()
 
 bool TextToModelMerger::load(const QString &data, DifferenceHandler &differenceHandler)
 {
-//    qDebug() << "TextToModelMerger::load with data:" << data;
+    // maybe the project environment (kit, ...) changed, so we need to clean old caches
+    NodeMetaInfo::clearCache();
+
 
     const QUrl url = m_rewriterView->model()->fileUrl();