Merge pull request 'Give players fly priv when creative is enabled' (#1865) from NO11/MineClone2:privs into master

Reviewed-on: https://git.minetest.land/MineClone2/MineClone2/pulls/1865

mods/MISC/mcl_privs/init.lua

@@ -3,3 +3,27 @@ local S = minetest.get_translator(minetest.get_current_modname())
 minetest.register_privilege("maphack", {
 	description = S("Can place and use advanced blocks like mob spawners, command blocks and barriers."),
 })
+
+minetest.register_on_joinplayer(function(player)
+	local name = player:get_player_name()
+	local meta = player:get_meta()
+	if meta:get_int("fly_changed") == 1 then return end
+
+	local fly = nil
+	if minetest.is_creative_enabled(name) then
+		fly = true
+	end
+	local player_privs = minetest.get_player_privs(name)
+	player_privs.fly = fly
+	minetest.set_player_privs(name, player_privs)
+end)
+
+for _, action in pairs({"grant", "revoke"}) do
+	minetest["register_on_priv_" .. action](function(name, _, priv)
+		if priv == "fly" then
+			local player = minetest.get_player_by_name(name)
+			local meta = player:get_meta()
+			meta:set_int("fly_changed", 1)
+		end
+	end)
+end