A1 = function(key)
	B()
end
	compute_layout(node, node.x,node.y, Surface)
	-- continue the pipeline
	-- like A, but updating a single node
	-- this only works because Nodes is a flat array; we don't support row/col types here yet
	-- delete previously added shapes for this node:
	for i=#Surface,1,-1 do
		local x = Surface[i]
		if x.key == key then
			table.remove(Surface, i)
		end
	end	
	local node = Definitions[key]

		compute_layout(Global_state.thread, 0,0, Surface, preserve_screen_top_of_cursor_node)

		compute_layout(Global_state.thread, 0,0, Surface)

	compute_viewport_bounds()

		compute_layout(node, node.x,node.y, Surface)

	B()

			A(--[[preserve screen_top of cursor node]] true)

			A()

			B(--[[preserve screen_top of cursor node]] true)

			B()

	elseif Cursor_node and Cursor_node.editor.cursor_x then

end
				A()
				B()

	elseif Cursor_node and Cursor_node.editor.cursor_x then

		B()

end

	--[[ --debug prints when modifying the DOM
	if node.type == 'rows' or node.type == 'cols' then
		print(node.type, node.button, #node.data)
	else
		print(node.type, node.button)
	end
	--]]

compute_layout = function(node, x,y, nodes_to_render)

compute_layout = function(node, x,y, nodes_to_render)

end

end

print('mouse press inside node')

end

end