my_tasklist_update.lua

-- Add tooltip to tasklist {{{
-- Ref: https://awesome.naquadah.org/bugs/index.php?do=details&task_id=1250
-- NOTE: interferes/prevents sloppy focus when coming through the tooltip.
local my_tasklist_update = function(w, buttons, label, data, objects)
    awful.widget.common.list_update(w, buttons, label, data, objects)

    for _,o in ipairs(objects) do
      if not data[o].tooltip then
        data[o].tooltip = awful.tooltip({
          objects = { data[o].tb },
          delay_show = 1,
        })

        -- Change textbox (once).
        data[o].tb:set_ellipsize("middle")
      end
      data[o].tooltip:set_text(data[o].tb._layout.text)
    end
end