Fixed sorting of filenames and directories in directory view

src/directories.cc

@@ -588,15 +588,20 @@ void Directories::add_or_update_path(const boost::filesystem::path &dir_path, co
       child->set_value(column_record.name, filename);
       child->set_value(column_record.markup, Glib::Markup::escape_text(filename));
       child->set_value(column_record.path, it->path());
+      auto sortable_filename = filename;
+      for(auto &e : sortable_filename) {
+        if(e == '.')
+          e = '$';
+      }
       if(boost::filesystem::is_directory(it->path())) {
-        child->set_value(column_record.id, '1' + filename);
+        child->set_value(column_record.id, '1' + sortable_filename);
         auto grandchild = tree_store->append(child->children());
         grandchild->set_value(column_record.name, std::string("(empty)"));
         grandchild->set_value(column_record.markup, Glib::Markup::escape_text("(empty)"));
         grandchild->set_value(column_record.type, PathType::UNKNOWN);
       }
       else {
-        child->set_value(column_record.id, '2' + filename);
+        child->set_value(column_record.id, '2' + sortable_filename);
 
         auto language = Source::guess_language(it->path().filename());
         if(!language)