The window stack ID to use as the master top-level.
This sets the ID string to be used as the master top-level window as the base of a stack of windows. This must be set before the first time the window is shown and should never be changed afterwards.
Since 1.22
@property stack_master_id @beta { get {} set {} values { id: string; } }
const char *efl_ui_win_stack_master_id_get(const Eo *obj); void efl_ui_win_stack_master_id_set(Eo *obj, const char *id);