switch focus to client on new screen upon mouse move

[Gabe Martin]

heyo, erryone.
i'm trying to switch focus to the most recently focused client on a
different screen when the mouse moves into it. so far i've tried:

for s = 1, screen.count() do
    screen[s]:connect_signal("mouse::enter", function(s)
        screen.focus(s)
        client.focus = client.focus.history.get(s)
    end)
end

for s = 1, screen.count() do
    screen[s]:connect_signal("mouse::enter", function(s)
        client.focus = client.focus.history.get(s)
    end)
end

and

for s = 1, screen.count() do
    screen[s]:connect_signal("mouse::enter", function(s)
        client.focus = client.focus.history.get(screen[s])
    end)
end

to no avail.

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