awesome, set client as slave

gistfile1.lua

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-- Set the client as slave: put it at the end of other windows.
-- Backport from git (fa1ca807)
-- @param c The window to set as slave.
--------------------------------------------------------------------------------
function setslave(c)
    local cls = capi.client.get(c.screen)
    for k, v in pairs(cls) do
        c:swap(v)
    end
end