Merge pull request 'master use mostly almost possible of 5.1 on 4.0 (not 0.4)' (#1) from master into stable-4.0

Reviewed-on: https://codeberg.org/minenux/minetest-game-minetest/pulls/1

README.txt

@@ -1,7 +1,6 @@
-Minetest Game [minetest_game]
-=============================
+# Minetest4 Game
+
 The main game for the Minetest engine
-=====================================
 
 To use this game with the Minetest engine, insert this repository as
 	/games/minetest_game
@@ -11,16 +10,15 @@ The Minetest engine can be found in:
 
 Compatibility
 --------------
-The Minetest Game github master HEAD is generally compatible with the github
-master HEAD of the Minetest engine.
 
-Additionally, when the Minetest engine is tagged to be a certain version (eg.
-0.4.10), Minetest Game is tagged with the version too.
+This source code and files are only compatible with matched minetest4 engine
+from https://codeberg.org/minenux/minetest-engine/src/branch/stable-4.0 
+Additionally, when the Minetest4 engine is tagged to be a certain version (e.g.
+4.0.18), Minetest Game is tagged with the version 4.0.18 too.
 
-When stable releases are made, Minetest Game is packaged and made available in
-	http://minetest.net/downloads/
-and in case the repository has grown too much, it may be reset. In that sense,
-this is not a "real" git repository. (Package maintainers please note!)
+When stable releases are made, Minetest Game and the Minetest engine is packaged 
+and made available at https://codeberg.org/minenux/minetest-engine/archive/stable-4.0.tar.gz 
+or generally at https://codeberg.org/minenux/minetest-engine/releases/tag/4.0.18 by example.
 
 Licensing
 ---------

game.conf

@@ -1,3 +1,3 @@
-name = Minetest Game
+name = Minetest4
 author = minetest
-description = Bundled by default with Minetest, and aims to be lightweight, moddable, and fairly playable without mods.
+description = Bundled by default with Minetest4

minetest.conf.example

@@ -1,5 +1,5 @@
-# This file contains settings of Minetest Game that can be changed in
-# minetest.conf.
+# This file contains settings of minetest4 Game that can be changed in
+# minetest4.conf.
 # By default, all the settings are commented and not functional.
 # Uncomment settings by removing the preceding #.
 

mods/default/craftitems.lua

@@ -214,7 +214,8 @@ minetest.register_craftitem("default:skeleton_key", {
 			return itemstack
 		end
 
-		local on_skeleton_key_use = minetest.registered_nodes[node.name].on_skeleton_key_use
+		local node_reg = minetest.registered_nodes[node.name]
+		local on_skeleton_key_use = node_reg and node_reg.on_skeleton_key_use
 		if not on_skeleton_key_use then
 			return itemstack
 		end

mods/tnt/init.lua

@@ -229,12 +229,16 @@ local function add_effects(pos, radius, drops)
 	-- we just dropped some items. Look at the items entities and pick
 	-- one of them to use as texture
 	local texture = "tnt_blast.png" --fallback texture
+	local node
 	local most = 0
 	for name, stack in pairs(drops) do
 		local count = stack:get_count()
 		if count > most then
 			most = count
 			local def = minetest.registered_nodes[name]
+			if def then
+				node = { name = name }
+			end
 			if def and def.tiles and def.tiles[1] then
 				texture = def.tiles[1]
 			end
@@ -252,9 +256,11 @@ local function add_effects(pos, radius, drops)
 		maxacc = {x = 0, y = -10, z = 0},
 		minexptime = 0.8,
 		maxexptime = 2.0,
-		minsize = radius * 0.66,
-		maxsize = radius * 2,
+		minsize = radius * 0.33,
+		maxsize = radius,
 		texture = texture,
+		-- ^ only as fallback for clients without support for `node` parameter
+		node = node,
 		collisiondetection = true,
 	})
 end
@@ -283,10 +289,15 @@ local function tnt_explode(pos, radius, ignore_protection, ignore_on_blast, owne
 	local a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
 	local data = vm1:get_data()
 	local count = 0
-	local c_tnt = minetest.get_content_id("tnt:tnt")
+	local c_tnt
 	local c_tnt_burning = minetest.get_content_id("tnt:tnt_burning")
 	local c_tnt_boom = minetest.get_content_id("tnt:boom")
 	local c_air = minetest.get_content_id("air")
+	if enable_tnt then
+		c_tnt = minetest.get_content_id("tnt:tnt")
+	else
+		c_tnt = c_tnt_burning -- tnt is not registered if disabled
+	end
 	-- make sure we still have explosion even when centre node isnt tnt related
 	if explode_center then
 		count = 1