Seal/abstract/virtual everything (#6739)

Content.Server/AI/Pathfinding/Accessible/PathfindingRegion.cs

@@ -7,7 +7,7 @@ namespace Content.Server.AI.Pathfinding.Accessible
     /// A group of homogenous PathfindingNodes inside a single chunk
     /// </summary>
     /// Makes the graph smaller and quicker to traverse
-    public class PathfindingRegion : IEquatable<PathfindingRegion>
+    public sealed class PathfindingRegion : IEquatable<PathfindingRegion>
     {
         /// <summary>
         /// Bottom-left reference node of the region

Content.Server/AI/Pathfinding/Pathfinders/AStarPathfindingJob.cs

@@ -9,7 +9,7 @@ using Robust.Shared.Utility;
 
 namespace Content.Server.AI.Pathfinding.Pathfinders
 {
-    public class AStarPathfindingJob : Job<Queue<TileRef>>
+    public sealed class AStarPathfindingJob : Job<Queue<TileRef>>
     {
 #if DEBUG
         public static event Action<SharedAiDebug.AStarRouteDebug>? DebugRoute;

Content.Server/AI/Pathfinding/Pathfinders/JpsPathfindingJob.cs

@@ -11,7 +11,7 @@ using Robust.Shared.Utility;
 
 namespace Content.Server.AI.Pathfinding.Pathfinders
 {
-    public class JpsPathfindingJob : Job<Queue<TileRef>>
+    public sealed class JpsPathfindingJob : Job<Queue<TileRef>>
     {
         // Some of this is probably fugly due to other structural changes in pathfinding so it could do with optimisation
         // Realistically it's probably not getting used given it doesn't support tile costs which can be very useful

Content.Server/AI/Pathfinding/Pathfinders/PathfindingComparer.cs

@@ -3,7 +3,7 @@ using System.Collections.Generic;
 
 namespace Content.Server.AI.Pathfinding.Pathfinders
 {
-    public class PathfindingComparer : IComparer<ValueTuple<float, PathfindingNode>>
+    public sealed class PathfindingComparer : IComparer<ValueTuple<float, PathfindingNode>>
     {
         public int Compare((float, PathfindingNode) x, (float, PathfindingNode) y)
         {

Content.Server/AI/Pathfinding/PathfindingChunk.cs

@@ -9,7 +9,7 @@ using Robust.Shared.Timing;
 
 namespace Content.Server.AI.Pathfinding
 {
-    public class PathfindingChunkUpdateMessage : EntityEventArgs
+    public sealed class PathfindingChunkUpdateMessage : EntityEventArgs
     {
         public PathfindingChunk Chunk { get; }
 
@@ -19,7 +19,7 @@ namespace Content.Server.AI.Pathfinding
         }
     }
 
-    public class PathfindingChunk
+    public sealed class PathfindingChunk
     {
         public TimeSpan LastUpdate { get; private set; }
         public GridId GridId { get; }

Content.Server/AI/Pathfinding/PathfindingNode.cs

@@ -13,7 +13,7 @@ using Robust.Shared.Utility;
 
 namespace Content.Server.AI.Pathfinding
 {
-    public class PathfindingNode
+    public sealed class PathfindingNode
     {
         public PathfindingChunk ParentChunk => _parentChunk;
         private readonly PathfindingChunk _parentChunk;

Content.Server/AI/Pathfinding/PathfindingSystem.cs

@@ -27,7 +27,7 @@ namespace Content.Server.AI.Pathfinding
     /// This system handles pathfinding graph updates as well as dispatches to the pathfinder
     /// (90% of what it's doing is graph updates so not much point splitting the 2 roles)
     /// </summary>
-    public class PathfindingSystem : EntitySystem
+    public sealed class PathfindingSystem : EntitySystem
     {
         [Dependency] private readonly IMapManager _mapManager = default!;
         [Dependency] private readonly IEntityManager _entityManager = default!;

Content.Server/AI/Pathfinding/ServerPathfindingDebugSystem.cs

@@ -11,7 +11,7 @@ namespace Content.Server.AI.Pathfinding
 {
 #if DEBUG
     [UsedImplicitly]
-    public class ServerPathfindingDebugSystem : EntitySystem
+    public sealed class ServerPathfindingDebugSystem : EntitySystem
     {
         public override void Initialize()
         {