Don't send more than one ServerboundSwingPacket per tick

Should address #2875

core/src/main/java/org/geysermc/geyser/session/GeyserSession.java

@@ -457,7 +457,6 @@ public class GeyserSession implements GeyserConnection, GeyserCommandSource {
      * Counts how many ticks have occurred since an arm animation started.
      * -1 means there is no active arm swing.
      */
-    @Getter(AccessLevel.NONE)
     private int armAnimationTicks = -1;
 
     /**

core/src/main/java/org/geysermc/geyser/translator/protocol/bedrock/BedrockAnimateTranslator.java

@@ -49,8 +49,23 @@ public class BedrockAnimateTranslator extends PacketTranslator<AnimatePacket> {
             case SWING_ARM ->
                 // Delay so entity damage can be processed first
                 session.scheduleInEventLoop(() -> {
+                        if (session.getArmAnimationTicks() != 0) {
+                            // So, generally, a Java player can only do one *thing* at a time.
+                            // If a player right-clicks, for example, then there's probably only one action associated with
+                            // that right-click that will send a swing.
+                            // The only exception I can think of to this, *maybe*, is a player dropping items
+                            // Bedrock is a little funkier than this - it can send several arm animation packets in the
+                            // same tick, notably with high levels of haste applied.
+                            // Packet limiters do not like this and can crash the player.
+                            // If arm animation ticks is 0, then we just sent an arm swing packet this tick.
+                            // See https://github.com/GeyserMC/Geyser/issues/2875
+                            // This behavior was last touched on with ViaVersion 4.5.1 (with its packet limiter), Java 1.16.5,
+                            // and Bedrock 1.19.51.
+                            // Note for the future: we should probably largely ignore this packet and instead replicate
+                            // all actions on our end, and send swings where needed.
                             session.sendDownstreamPacket(new ServerboundSwingPacket(Hand.MAIN_HAND));
                             session.activateArmAnimationTicking();
+                        }
                     },
                     25,
                     TimeUnit.MILLISECONDS