ProjectExplorer: Try harder to sort ProjectTree entries

Task-number: QTCREATORBUG-18081
Change-Id: Ie924a5969ee38b1a634fcd7cbbc46c0540f9d8a4
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/projectexplorer/projectmodels.cpp

@@ -195,6 +195,8 @@ void FlatModel::addOrRebuildProjectModel(Project *project)
         container->appendChild(new WrapperNode(projectFileNode));
     }
 
+    container->sortChildren(&sortWrapperNodes);
+
     container->forAllChildren([this](WrapperNode *node) {
         if (node->m_node) {
             const QString path = node->m_node->filePath().toString();