manifest_index = function(fy, fx, fwidth)
	local y,x = Menu_bar_height, 5
	local best_guess, best_guess_x, best_guess_width
	for i,definition in ipairs(Manifest_navigator.candidates) do
		local width = to_hud_text(definition):getWidth()
		if x + width > App.screen.width - 5 then
			y = y + HUD_line_height
			x = 5
		end
		if y == fy then
			if best_guess == nil then
				best_guess = i
				best_guess_x = x
				best_guess_width = width
			elseif math.abs(fx + fwidth/2 - x - width/2) < math.abs(fx + fwidth/2 - best_guess_x - best_guess_width/2) then
				best_guess = i
				best_guess_x = x
				best_guess_width = width
			end
		end
		x = x + width + 30
	end
	return best_guess
end