def default_window(win_id):
    """return default config for one window"""
    win = {}
    win['win_id']    = win_id
    win['mfact']     = 0.55
    win['nmaster']   = 1
    win['layout']    = 'horizontal'
    win['zoomed']    = False
    win['num_panes'] = 1
    win['last_master_pane_id'] = None
    win['last_non_master_pane_id'] = None
    return win