awesome wm ,keep client on top

使当前窗口保持在最顶端：
clientkeys = awful.util.table.join(
...
awful.key({ modkey, "Shift" }, "t", function (c) c.ontop = not c.ontop end),
...
)
或者加到awful.rules中，如对mplayer
-- {{{ Rules
awful.rules.rules = {
-- All clients will match this rule.
{ rule = { class = "MPlayer" },
properties = { floating = true,
ontop = true } },
}
-- }}}