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 Definitions to Surface
	Surface = {}
	for key,node in pairs(Definitions) do
		node.key = key
		compute_layout(node, node.x,node.y, Surface, preserve_screen_top_of_cursor_node)
	end
	-- continue the pipeline
	B(preserve_screen_top_of_cursor_node)
	-- TODO: ugly that we're manipulating editor objects twice
end