A = function(preserve_screen_top_of_cursor_node)
--	print('A')
	love.graphics.setFont(love.graphics.newFont(scale(20)))  -- editor objects implicitly depend on current font
	-- translate Global_state.root to Surface
	Surface = {}
	compute_layout(Global_state.root, 0,0, Surface, preserve_screen_top_of_cursor_node)
	-- continue the pipeline
	B(preserve_screen_top_of_cursor_node)
	-- TODO: ugly that we're manipulating editor objects twice
end