A = function()
--	print('A')
	local font = love.graphics.newFont(scale(20))
	love.graphics.setFont(font)  -- editor objects implicitly depend on current font
	-- translate some page in Global_state to Surface
	Surface = {}
	if Global_state.thread == nil then
		lay_out_file_picker()
	else
		compute_layout(Global_state.thread, 0,0, Surface, font)
	end
	compute_viewport_bounds()
	-- continue the pipeline
	B(font)
	-- TODO: ugly that we're manipulating editor objects twice
end