correctly map root folder to source model

app/panel/project/project.cpp

@@ -103,9 +103,9 @@ void ProjectPanel::set_project(Project* p)
   }
 }
 
-QModelIndex ProjectPanel::get_root_index() const
+Folder *ProjectPanel::get_root() const
 {
-  return explorer_->get_root_index();
+  return explorer_->get_root();
 }
 
 void ProjectPanel::set_root(Folder *item)
@@ -170,7 +170,7 @@ void ProjectPanel::Edit(Node* item)
 
 void ProjectPanel::Retranslate()
 {
-  if (explorer_->get_root_index().isValid()) {
+  if (project() && explorer_->get_root() != project()->root()) {
     SetTitle(tr("Folder"));
   } else {
     SetTitle(tr("Project"));
@@ -207,10 +207,10 @@ void ProjectPanel::UpdateSubtitle()
   if (project()) {
     QString project_title = QStringLiteral("[*]%1").arg(project()->name());
 
-    if (explorer_->get_root_index().isValid()) {
+    if (explorer_->get_root() != project()->root()) {
       QString folder_path;
 
-      Folder* item = static_cast<Folder*>(explorer_->get_root_index().internalPointer());
+      Folder* item = explorer_->get_root();
 
       do {
         folder_path.prepend(QStringLiteral("/%1").arg(item->GetLabel()));

app/panel/project/project.h

@@ -40,7 +40,7 @@ public:
   Project* project() const;
   void set_project(Project* p);
 
-  QModelIndex get_root_index() const;
+  Folder *get_root() const;
 
   void set_root(Folder* item);
 

app/widget/projectexplorer/projectexplorer.cpp

@@ -511,9 +511,15 @@ void ProjectExplorer::set_project(Project *p)
   model_.set_project(p);
 }
 
-QModelIndex ProjectExplorer::get_root_index() const
+Folder *ProjectExplorer::get_root() const
 {
-  return tree_view_->rootIndex();
+  QModelIndex root_index = sort_model_.mapToSource(tree_view_->rootIndex());
+
+  if (!root_index.isValid()) {
+    return project()->root();
+  }
+
+  return static_cast<Folder *>(root_index.internalPointer());
 }
 
 void ProjectExplorer::set_root(Folder *item)

app/widget/projectexplorer/projectexplorer.h

@@ -55,8 +55,7 @@ public:
   Project* project() const;
   void set_project(Project* p);
 
-  QModelIndex get_root_index() const;
-
+  Folder *get_root() const;
   void set_root(Folder *item);
 
   QVector<Node *> SelectedItems() const;

app/window/mainwindow/mainwindow.cpp

@@ -154,7 +154,7 @@ MainWindowLayoutInfo MainWindow::SaveLayout() const
 
   foreach (ProjectPanel* panel, folder_panels_) {
     if (panel->project()) {
-      info.add_folder(static_cast<Folder*>(panel->get_root_index().internalPointer()));
+      info.add_folder(panel->get_root());
     }
   }