Fix saplings placement

mods/main/saplings.lua

@@ -16,16 +16,25 @@ minetest.register_node("main:sapling", {
 		type = "fixed",
 		fixed = {-4 / 16, -0.5, -4 / 16, 4 / 16, 7 / 16, 4 / 16}
 	},
-	on_place = function(itemstack, placer, pointed_thing)
+	on_place =  on_rightclick or function(itemstack, placer, pointed_thing)
 		if not pointed_thing.type == "node" then
 			return
 		end
+		local buildable = minetest.registered_nodes[minetest.get_node(pointed_thing.under).name].buildable_to
+		--replace buildable
+		if buildable and minetest.get_node_group(minetest.get_node(vector.new(pointed_thing.under.x,pointed_thing.under.y-1,pointed_thing.under.z)).name, "soil") > 0 then
+			return(minetest.item_place(itemstack, placer, pointed_thing))
+		end
+		local buildable = minetest.registered_nodes[minetest.get_node(pointed_thing.above).name].buildable_to
+		if buildable and minetest.get_node_group(minetest.get_node(vector.new(pointed_thing.above.x,pointed_thing.above.y-1,pointed_thing.above.z)).name, "soil") > 0 then
+			return(minetest.item_place(itemstack, placer, pointed_thing))
+		end
+		--place sapling
 		local pos = pointed_thing.above
 		if minetest.get_node_group(minetest.get_node(vector.new(pos.x,pos.y-1,pos.z)).name, "soil") > 0 and minetest.get_node(pointed_thing.above).name == "air" then
 			minetest.set_node(pointed_thing.above, {name="main:sapling"})
 			minetest.sound_play("leaves",{pos=pointed_thing.above})
 			itemstack:take_item(1)
-			--print(minetest.get_node(pointed_thing.above).param1)
 			return(itemstack)
 		end
 	end,