player/handler.go: Call HandleChangeWorld again.

server/player/handler.go

@@ -26,7 +26,6 @@ type Handler interface {
 	// HandleTeleport handles the teleportation of a player. ctx.Cancel() may be called to cancel it.
 	HandleTeleport(ctx *Context, pos mgl64.Vec3)
 	// HandleChangeWorld handles when the player is added to a new world. before may be nil.
-	// TODO: NOTE: This handler is currently not called.
 	HandleChangeWorld(before, after *world.World)
 	// HandleToggleSprint handles when the player starts or stops sprinting.
 	// After is true if the player is sprinting after toggling (changing their sprinting state).

server/player/player.go

@@ -96,6 +96,8 @@ type playerData struct {
 	hunger *hungerManager
 
 	once sync.Once
+
+	prevWorld *world.World
 }
 
 // Player is an implementation of a player entity. It has methods that implement the behaviour that players
@@ -2291,7 +2293,7 @@ func (p *Player) Latency() time.Duration {
 }
 
 // Tick ticks the entity, performing actions such as checking if the player is still breaking a block.
-func (p *Player) Tick(_ *world.Tx, current int64) {
+func (p *Player) Tick(tx *world.Tx, current int64) {
 	if p.Dead() {
 		return
 	}
@@ -2352,6 +2354,11 @@ func (p *Player) Tick(_ *world.Tx, current int64) {
 		}
 	}
 
+	if p.prevWorld != tx.World() && p.prevWorld != nil {
+		p.Handler().HandleChangeWorld(p.prevWorld, tx.World())
+		p.prevWorld = tx.World()
+	}
+
 	if p.session() == session.Nop && !p.Immobile() {
 		m := p.mc.TickMovement(p, p.Position(), p.Velocity(), p.Rotation(), p.tx)
 		m.Send()