Arachnid zombie hands fix (#19073)

* zombie hands begone

* the shortening

* Move it to SharedHandsSystem

* do the requested changes

Content.Server/Zombies/ZombieSystem.Transform.cs

@@ -33,6 +33,7 @@ using Content.Shared.Tools.Components;
 using Content.Shared.Weapons.Melee;
 using Content.Shared.Zombies;
 using Robust.Shared.Audio;
+using System.Linq;
 
 namespace Content.Server.Zombies
 {
@@ -244,18 +245,10 @@ namespace Content.Server.Zombies
                 ghostRole.RoleRules = Loc.GetString("zombie-role-rules");
             }
 
-            //Goes through every hand, drops the items in it, then removes the hand
+            if (TryComp<HandsComponent>(target, out var handsComp))
-            //may become the source of various bugs.
-            if (TryComp<HandsComponent>(target, out var hands))
             {
-                foreach (var hand in _hands.EnumerateHands(target))
+                _hands.RemoveHands(target);
-                {
+                RemComp(target, handsComp);
-                    _hands.SetActiveHand(target, hand, hands);
-                    _hands.DoDrop(target, hand, handsComp: hands);
-                    _hands.RemoveHand(target, hand.Name, hands);
-                }
-
-                RemComp(target, hands);
             }
 
             // No longer waiting to become a zombie:

Content.Shared/Hands/EntitySystems/SharedHandsSystem.cs

@@ -77,6 +77,32 @@ public abstract partial class SharedHandsSystem : EntitySystem
         Dirty(handsComp);
     }
 
+    /// <summary>
+    /// Gets rid of all the entity's hands.
+    /// </summary>
+    /// <param name="uid"></param>
+    /// <param name="handsComp"></param>
+
+    public void RemoveHands(EntityUid uid, HandsComponent? handsComp = null)
+    {
+        if (!Resolve(uid, ref handsComp))
+            return;
+
+        RemoveHands(uid, EnumerateHands(uid), handsComp);
+    }
+
+    private void RemoveHands(EntityUid uid, IEnumerable<Hand> hands, HandsComponent handsComp)
+    {
+        if (!hands.Any())
+            return;
+
+        var hand = hands.First();
+        RemoveHand(uid, hand.Name, handsComp);
+
+        // Repeats it for any additional hands.
+        RemoveHands(uid, hands, handsComp);
+    }
+
     private void HandleSetHand(RequestSetHandEvent msg, EntitySessionEventArgs eventArgs)
     {
         if (eventArgs.SenderSession.AttachedEntity == null)