don't expand if still creating the representation

when qml object gets created with an async incubator,
events are still processed, so we have to guard gainst
double triggers that can lead to creating the
extended representation again
BUG:335406

src/plasmaquick/appletquickitem.cpp

@@ -48,7 +48,8 @@ AppletQuickItemPrivate::AppletQuickItemPrivate(Plasma::Applet *a, AppletQuickIte
       switchWidth(-1),
       switchHeight(-1),
       applet(a),
-      expanded(false)
+      expanded(false),
+      creatingFullRepresentation(false)
 {
 }
 
@@ -184,7 +185,9 @@ QObject *AppletQuickItemPrivate::createFullRepresentationItem()
     }
 
     if (fullRepresentation && fullRepresentation.data() != qmlObject->mainComponent()) {
+        creatingFullRepresentation = true;
         fullRepresentationItem = qmlObject->createObjectFromComponent(fullRepresentation.data(), QtQml::qmlContext(qmlObject->rootObject()));
+        creatingFullRepresentation = false;
     } else {
         fullRepresentation = qmlObject->mainComponent();
         fullRepresentationItem = qmlObject->rootObject();
@@ -625,6 +628,10 @@ bool AppletQuickItem::isExpanded() const
 
 void AppletQuickItem::setExpanded(bool expanded)
 {
+    if (d->creatingFullRepresentation) {
+        return;
+    }
+
     if (d->applet->isContainment()) {
         expanded = true;
     }

src/plasmaquick/private/appletquickitem_p.h

@@ -101,6 +101,7 @@ public:
     Plasma::Package coronaPackage;
 
     bool expanded : 1;
+    bool creatingFullRepresentation : 1;
 
     static QHash<QObject *, AppletQuickItem *> s_rootObjects;
 };