expand/collapse group on double click

src/applications/browser.py

@@ -368,6 +368,11 @@ class Browser(Gtk.Box):
                 pkg = self.config(self.app_store[path][PACKAGE])
                 if pkg:
                     self.set_detail_box(pkg["name"])
+            else:
+                if treeview.row_expanded(path):
+                    treeview.collapse_row(path)
+                else:
+                    treeview.expand_to_path(path)
 
     def on_reload_clicked(self, widget):
         self.reload_app_data()