QmlDesigner: Add lock functionality to navigator

* Update icon font and change related theme and constants files
* Add locked column to Navigator
* Add auxiliary property "locked"
* Integrate locked feature into the following components:
  * Transition Editor
  * Connection Editor
  * Form Editor
  * Text Editor
  * Timeline
  * Navigator
  * State Editor

Task-number: QDS-826
Change-Id: Ibf3ae96e0d5daeb1ab00279b94df5aaabe75e0bb
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/plugins/qmldesigner/components/connectioneditor/connectionview.cpp

@@ -36,6 +36,8 @@
 #include <variantproperty.h>
 #include <signalhandlerproperty.h>
 
+#include <QTableView>
+
 namespace QmlDesigner {
 
 namespace  Internal {
@@ -162,6 +164,33 @@ void ConnectionView::selectedNodesChanged(const QList<ModelNode> & selectedNodeL
         emit connectionViewWidget()->setEnabledAddButton(selectedNodeList.count() == 1);
 }
 
+void ConnectionView::auxiliaryDataChanged(const ModelNode &node,
+                                          const PropertyName &name,
+                                          const QVariant &data)
+{
+    Q_UNUSED(node)
+
+    // Check if the auxiliary data is actually the locked property or if it is unlocked
+    if (name != QmlDesigner::lockedProperty || !data.toBool())
+        return;
+
+    QItemSelectionModel *selectionModel = connectionTableView()->selectionModel();
+    if (!selectionModel->hasSelection())
+        return;
+
+    QModelIndex modelIndex = selectionModel->currentIndex();
+    if (!modelIndex.isValid() || !model())
+        return;
+
+    const int internalId = connectionModel()->data(connectionModel()->index(modelIndex.row(),
+                                                                            ConnectionModel::TargetModelNodeRow),
+                                                   ConnectionModel::UserRoles::InternalIdRole).toInt();
+    ModelNode modelNode = modelNodeForInternalId(internalId);
+
+    if (modelNode.isValid() && ModelNode::isThisOrAncestorLocked(modelNode))
+        selectionModel->clearSelection();
+}
+
 void ConnectionView::importsChanged(const QList<Import> & /*addedImports*/, const QList<Import> & /*removedImports*/)
 {
     backendModel()->resetModel();