You can download the plugin from https://github.com/SamJBarney/LeafDecayPrevention . That should solve your problems, but it will slow down initial loading of chunks a little bit.
Once you've loaded in all of the chunks, disable and remove the plugin. Prevention will last beyond the plugin being loaded.
-- edited by xoft to fix the link
Once you've loaded in all of the chunks, disable and remove the plugin. Prevention will last beyond the plugin being loaded.
-- edited by xoft to fix the link