Fix wallmount board dropping at random side of the wall (#21920)

* empty wallmount board at user

* change to DropNextTo

* add emptyAtUser to doors

Content.Server/Construction/Completions/EmptyAllContainers.cs

@@ -3,7 +3,10 @@ using Content.Shared.Construction;
 using Content.Shared.Hands.Components;
 using JetBrains.Annotations;
 using Robust.Server.Containers;
+using Robust.Server.GameObjects;
 using Robust.Shared.Containers;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Map;
 
 namespace Content.Server.Construction.Completions
 {
@@ -14,9 +17,15 @@ namespace Content.Server.Construction.Completions
         /// <summary>
         ///     Whether or not the user should attempt to pick up the removed entities.
         /// </summary>
-        [DataField("pickup")]
+        [DataField]
         public bool Pickup = false;
 
+        /// <summary>
+        ///    Whether or not to empty the container at the user's location.
+        /// </summary>
+        [DataField]
+        public bool EmptyAtUser = false;
+
         public void PerformAction(EntityUid uid, EntityUid? userUid, IEntityManager entityManager)
         {
             if (!entityManager.TryGetComponent(uid, out ContainerManagerComponent? containerManager))
@@ -24,6 +33,7 @@ namespace Content.Server.Construction.Completions
 
             var containerSys = entityManager.EntitySysManager.GetEntitySystem<ContainerSystem>();
             var handSys = entityManager.EntitySysManager.GetEntitySystem<HandsSystem>();
+            var transformSys = entityManager.EntitySysManager.GetEntitySystem<TransformSystem>();
 
             HandsComponent? hands = null;
             var pickup = Pickup && entityManager.TryGetComponent(userUid, out hands);
@@ -32,6 +42,9 @@ namespace Content.Server.Construction.Completions
             {
                 foreach (var ent in containerSys.EmptyContainer(container, true, reparent: !pickup))
                 {
+                    if (EmptyAtUser && userUid is not null)
+                        transformSys.DropNextTo(ent, (EntityUid) userUid);
+
                     if (pickup)
                         handSys.PickupOrDrop(userUid, ent, handsComp: hands);
                 }