The methods g_file_copy() and g_file_create(), as well as others have async versions (g_file_copy_async(), g_file_create_async() respectively). But there are no async versions for g_file_delete() or g_file_trash(). 

While delete is not usually a long running operation, it can still block the main loop if done on a remote filesystem. At the very least, the documentation should provide some explanation of why the async versions do not exist for the delete and trash methods.