QmlDesigner: Move cursor to selected item

When an item is selected in the navigator we move the cursor.

Change-Id: Ia6d41e4d7bdf38688cf0cd73f134c349126eb68e
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/qmldesigner/components/texteditor/texteditorwidget.h

@@ -50,6 +50,7 @@ public:
     }
 
     QString contextHelpId() const;
+    void jumpTextCursorToSelectedModelNode();
 
 private:
     void updateSelectionByCursorPosition();