override coral "on_place" with fixed function until next mt_game release

fix pandorabox-io/pandorabox.io#358

hacks.lua

@@ -6,3 +6,55 @@
 minetest.find_path = function()
 	return nil
 end
+
+-- stolen from
+-- https://github.com/minetest/minetest_game/blob/d2e051f1795576213f807ec0feac5f72f51c6113/mods/default/nodes.lua
+-- fixes https://github.com/pandorabox-io/pandorabox.io/issues/358
+-- TODO: remove after upgrade to next mt_game > 5.1.0
+local function coral_on_place(itemstack, placer, pointed_thing)
+	if pointed_thing.type ~= "node" or not placer then
+		return itemstack
+	end
+
+	local player_name = placer:get_player_name()
+	local pos_under = pointed_thing.under
+	local pos_above = pointed_thing.above
+	local node_under = minetest.get_node(pos_under)
+	local def_under = minetest.registered_nodes[node_under.name]
+
+	if def_under and def_under.on_rightclick and not placer:get_player_control().sneak then
+		return def_under.on_rightclick(pos_under, node_under,
+				placer, itemstack, pointed_thing) or itemstack
+	end
+
+	if node_under.name ~= "default:coral_skeleton" or
+			minetest.get_node(pos_above).name ~= "default:water_source" then
+		return itemstack
+	end
+
+	if minetest.is_protected(pos_under, player_name) or
+			minetest.is_protected(pos_above, player_name) then
+		minetest.log("action", player_name
+			.. " tried to place " .. itemstack:get_name()
+			.. " at protected position "
+			.. minetest.pos_to_string(pos_under))
+		minetest.record_protection_violation(pos_under, player_name)
+		return itemstack
+	end
+
+	node_under.name = itemstack:get_name()
+	minetest.set_node(pos_under, node_under)
+	itemstack:take_item()
+
+	return itemstack
+end
+
+minetest.override_item("default:coral_green", {
+	on_place = coral_on_place
+})
+minetest.override_item("default:coral_pink", {
+	on_place = coral_on_place
+})
+minetest.override_item("default:coral_cyan", {
+	on_place = coral_on_place
+})