Lua primitives: set_selected_folder()
lumail allows you to select multiple folders to open at the same time.
The set_selected_folder() function removes all current folders from the list of selections, and adds the single specified folder in their place.
This allows you to open a folder "exclusively".
set_selected_folder( "/home/steve/Maildir/.Amazon.co.uk" );
This function has been available since version 0.07.