Fix loosing interact bug in mcl_shields

mods/ITEMS/mcl_shields/init.lua

@@ -211,16 +211,36 @@ local function set_interact(player, interact)
 		return
 	end
 	local meta = player:get_meta()
-	if meta:get_int("mcl_privs:interact_revoked") ~= 1 then
-		privs.interact = interact
-		minetest.set_player_privs(player_name, privs)
-		meta:set_int("mcl_privs:interact_revoked",0)
+
+	if interact and meta:get_int("mcl_shields:interact_revoked") ~= 0 then
+		meta:set_int("mcl_shields:interact_revoked", 0)
+		privs.interact = true
+	elseif not interact then
+		meta:set_int("mcl_shields:interact_revoked", privs.interact and 1 or 0)
+		privs.interact = nil
 	end
+
+	minetest.set_player_privs(player_name, privs)
 end
 
+-- Prevent player from being able to circumvent interact privilage removal by
+-- using shield.
+minetest.register_on_priv_revoke(function(name, revoker, priv)
+	if priv == "interact" and revoker then
+		local player = minetest.get_player_by_name(name)
+		if not player then
+			return
+		end
+		local meta = player:get_meta()
+		meta:set_int("mcl_shields:interact_revoked", 0)
+	end
+end)
+
 local shield_hud = {}
 
 local function remove_shield_hud(player)
+	set_interact(player, true)
+
 	if not shield_hud[player] then return end --this function takes a long time. only run it when necessary
 	player:hud_remove(shield_hud[player])
 	shield_hud[player] = nil
@@ -233,7 +253,6 @@ local function remove_shield_hud(player)
 	end
 
 	playerphysics.remove_physics_factor(player, "speed", "shield_speed")
-	set_interact(player, true)
 end
 
 local function add_shield_entity(player, i)
@@ -344,7 +363,7 @@ local function add_shield_hud(shieldstack, player, blocking)
 		z_index = -200,
 	})
 	playerphysics.add_physics_factor(player, "speed", "shield_speed", 0.5)
-	set_interact(player, nil)
+	set_interact(player, false)
 end
 
 local function update_shield_hud(player, blocking, shieldstack)