Fix wielding two-handed items with only one hand

Content.Shared/Hands/EntitySystems/SharedHandsSystem.cs

@@ -419,6 +419,9 @@ public bool HandIsEmpty(Entity<HandsComponent?> ent, string handId)
         return GetHeldItem(ent, handId) == null;
     }
 
+    /// <summary>
+    /// Counts the number of hands on this entity.
+    /// </summary>
     public int GetHandCount(Entity<HandsComponent?> ent)
     {
         if (!Resolve(ent, ref ent.Comp, false))
@@ -427,6 +430,9 @@ public int GetHandCount(Entity<HandsComponent?> ent)
         return ent.Comp.Hands.Count;
     }
 
+    /// <summary>
+    /// Counts the number of hands that are empty.
+    /// </summary>
     public int CountFreeHands(Entity<HandsComponent?> ent)
     {
         if (!Resolve(ent, ref ent.Comp, false))
@@ -442,6 +448,10 @@ public int CountFreeHands(Entity<HandsComponent?> ent)
         return free;
     }
 
+    /// <summary>
+    /// Counts the number of hands that can are empty or can be emptied by dropping an item.
+    /// Unremoveable items will cause a hand to not be freeable.
+    /// </summary>
     public int CountFreeableHands(Entity<HandsComponent> hands)
     {
         var freeable = 0;
@@ -453,4 +463,23 @@ public int CountFreeableHands(Entity<HandsComponent> hands)
 
         return freeable;
     }
+
+    /// <summary>
+    /// Counts the number of hands that can are empty or can be emptied by dropping an item, ignoring the hand the <paramref name="except"/> entity is in.
+    /// Unremoveable items will cause a hand to not be freeable.
+    /// </summary>
+    public int CountFreeableHandsExcept(Entity<HandsComponent> hands, EntityUid except)
+    {
+        var freeable = 0;
+        foreach (var name in hands.Comp.Hands.Keys)
+        {
+            if (GetHeldItem(hands.AsNullable(), name) == except)
+                continue;
+
+            if (HandIsEmpty(hands.AsNullable(), name) || CanDropHeld(hands, name))
+                freeable++;
+        }
+
+        return freeable;
+    }
 }

Content.Shared/Wieldable/SharedWieldableSystem.cs

@@ -259,7 +259,7 @@ public bool CanWield(EntityUid uid, WieldableComponent component, EntityUid user
             return false;
         }
 
-        if (_hands.CountFreeableHands((user, hands)) < component.FreeHandsRequired)
+        if (_hands.CountFreeableHandsExcept((user, hands), uid) < component.FreeHandsRequired)
         {
             if (!quiet)
             {