QmlDesigner: Fix section visibility

Change-Id: Ic663e7f8aa8916bb7531c1a2da05e6b2b45bfcb9
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>

src/plugins/qmldesigner/components/itemlibrary/itemlibrarymodel.cpp

@@ -242,8 +242,6 @@ ItemLibrarySection *ItemLibraryModel::sectionByName(const QString &sectionName)
 
 void ItemLibraryModel::updateVisibility()
 {
-    beginResetModel();
-    endResetModel();
     bool changed = false;
 
     foreach (ItemLibrarySection *itemLibrarySection, m_sectionModels) {

src/plugins/qmldesigner/components/itemlibrary/itemlibrarysection.h

@@ -40,7 +40,7 @@ class ItemLibrarySection: public QObject {
 
     Q_PROPERTY(QObject* sectionEntries READ sectionEntries NOTIFY sectionEntriesChanged FINAL)
     Q_PROPERTY(QString sectionName READ sectionName FINAL)
-    Q_PROPERTY(QString visible READ isVisible NOTIFY visibilityChanged FINAL)
+    Q_PROPERTY(bool sectionVisible READ isVisible NOTIFY visibilityChanged FINAL)
     Q_PROPERTY(bool sectionExpanded READ sectionExpanded FINAL)
     Q_PROPERTY(QVariant sortingRole READ sortingRole FINAL)