awesome-focus-filter.lua

        focus = function(c)
            -- if c.startup_id and snid_props_cb[c.startup_id] then
            --     -- Do not focus (yet).
            --     return false
            -- end
            local r
            if not awful.client.focus.filter(c) then
                r = false
            elseif c.type ~= "normal" and c.transient_for then
                -- Only restrict windows with parents!
                if awful.client.istransientfor(c, client.focus) then
                    r = c
                else
                    if not awesome.startup then
                        c.urgent = true
                    end
                    r = false
                end
            else
                r = c
            end
            -- local tb = debug.traceback()
            -- bdebug({c=c, c_name = c.name or "no name", skip_taskbar = c.skip_taskbar, hidden = c.hidden,
            --    c_type = c.type, c_focusable = tostring(c.focusable), c_transient_for = tostring(c.transient_for),
            --    client_focus=tostring(client.focus), tb = tb, r=r and true or r,
            --    }, 'rules: focus?')
            return r
        end,
        -- -- DEFAULT:
        -- focus = awful.client.focus.filter,