EffectMaker: Clear composition nodes on view attach

Fixes: QDS-10513
Change-Id: I3d2b1369c4e33fb6e21311c59a92625437382602
Reviewed-by: Qt CI Patch Build Bot <ci_patchbuild_bot@qt.io>
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>

src/plugins/effectmakernew/effectmakermodel.cpp

@@ -168,6 +168,19 @@ const QString &EffectMakerModel::qmlComponentString() const
     return m_qmlComponentString;
 }
 
+void EffectMakerModel::clear()
+{
+    if (m_nodes.isEmpty())
+        return;
+
+    for (CompositionNode *node : std::as_const(m_nodes))
+        delete node;
+
+    m_nodes.clear();
+
+    setIsEmpty(true);
+}
+
 const QList<Uniform *> EffectMakerModel::allUniforms()
 {
     QList<Uniform *> uniforms = {};

src/plugins/effectmakernew/effectmakermodel.h

@@ -70,6 +70,8 @@ public:
 
     const QString &qmlComponentString() const;
 
+    void clear();
+
     Q_INVOKABLE void updateQmlComponent();
 
     Q_INVOKABLE void resetEffectError(int type);

src/plugins/effectmakernew/effectmakerview.cpp

@@ -3,8 +3,9 @@
 
 #include "effectmakerview.h"
 
-#include "effectmakerwidget.h"
+#include "effectmakermodel.h"
 #include "effectmakernodesmodel.h"
+#include "effectmakerwidget.h"
 
 #include "nodeinstanceview.h"
 #include "qmldesignerconstants.h"
@@ -71,6 +72,7 @@ void EffectMakerView::modelAttached(QmlDesigner::Model *model)
     AbstractView::modelAttached(model);
 
     m_widget->effectMakerNodesModel()->loadModel();
+    m_widget->effectMakerModel()->clear();
     m_widget->initView();
 }