Start client fullscreen doesn't cover wibox - fullscreen

Question

When a client is started, it should be started fullscreen. I tried to configure this using rules but no matter what I do, the client doesn't cover the wibox.
What I have so far:
function set_fullscreen(c)
mywibox[c.screen].ontop = false
c.fullscreen = false
c.fullscreen = true
c.x = 0
c.y = 0
mywibox[c.screen].ontop = false
c.fullscreen = false
c.fullscreen = true
c.x = 0
c.y = 0
end
awful.rules.rules = {
{ rule = { },
properties = { border_width = beautiful.border_width,
border_color = beautiful.border_normal,
focus = awful.client.focus.filter,
keys = clientkeys,
buttons = clientbuttons } },
{ rule = { class = "<name>" },
properties = { fullscreen = true,
size_hints_honor = false,
focus = true },
callback = set_fullscreen }
}
I have my wibox on the bottom and the application gets painted above the wibox. It also gets painted off-screen above, the size of the wibox. The application seems to have the correct size, but the wibox seems to be in the way.
When I toggle fullscreen for the application, when it is already running, fullscreen works as expected. The application does cover the wibox.
function toggle_fullscreen(c)
c.fullscreen = not c.fullscreen
end
I also have a signal handler that toggles ontop for the wibox when a focussed client's fullscreen property changes:
client.connect_signal("property::fullscreen", function (c)
if c.fullscreen and c == client.focus then
mywibox[c.screen].ontop = false
else
mywibox[c.screen].ontop = true
end
end)
Nothing what I do seems to start the application in fullscreen, I always have to toggle manually. Anybody any idea what I am doing wrong?

Answer 1

client.connect_signal("property::fullscreen", function (c)
if c.fullscreen and c == client.focus then
mywibox[mouse.screen].visible = not mywibox[mouse.screen].visible
else
mywibox[mouse.screen].visible = not mywibox[mouse.screen].visible
end
end)
Work for me.

Answer 2

This should help:
function toggle_fullscreen(c)
c.fullscreen = not c.fullscreen
--TODO store the existing ontop state
c.ontop = c.fullscreen
c:raise()
end