update_editor_box = function(node, preserve_screen_top_of_cursor_node)

update_editor_box = function(node, skip_updating_screen_top_for)

	if node.y > Viewport.y then
		if node ~= Cursor_node then

	if node ~= skip_updating_screen_top_for then
		if node.y > Viewport.y then

			node.editor.top = vy(node.y)
		else
			node.editor.screen_top1, node.editor.top = schema1_of_y(node.editor, scale(Viewport.y-node.y))

		node.editor.top = vy(node.y)
	else
		node.editor.screen_top1, node.editor.top = schema1_of_y(node.editor, Viewport.y-node.y)

A = function(preserve_screen_top_of_cursor_node)

A = function(skip_updating_screen_top_for)

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

	compute_layout(Page, Page.x,Page.y, Surface, skip_updating_screen_top_for)

	B(preserve_screen_top_of_cursor_node)

	B(skip_updating_screen_top_for)

			A(--[[skip updating screen_top for]] Cursor_node)
			return

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

		A()

end

end

			A(--[[skip updating screen_top for]] Cursor_node)
			return

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

		A()

end

end

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

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

			update_editor_box(node, preserve_screen_top_of_cursor_node)

			update_editor_box(node, skip_updating_screen_top_for)

B = function(preserve_screen_top_of_cursor_node)

B = function(skip_updating_screen_top_for)

				update_editor_box(obj, preserve_screen_top_of_cursor_node)

				update_editor_box(obj, skip_updating_screen_top_for)

end

end