Improve sprite fading behaviour (#35863)

* Click through faded sprites

* Count the mouse position for which sprites to fade

Content.Client/Clickable/ClickableSystem.cs

@@ -1,4 +1,5 @@
 using System.Numerics;
+using Content.Client.Sprite;
 using Robust.Client.GameObjects;
 using Robust.Client.Graphics;
 using Robust.Client.Utility;
@@ -17,12 +18,14 @@ public sealed class ClickableSystem : EntitySystem
 
     private EntityQuery<ClickableComponent> _clickableQuery;
     private EntityQuery<TransformComponent> _xformQuery;
+    private EntityQuery<FadingSpriteComponent> _fadingSpriteQuery;
 
     public override void Initialize()
     {
         base.Initialize();
         _clickableQuery = GetEntityQuery<ClickableComponent>();
         _xformQuery = GetEntityQuery<TransformComponent>();
+        _fadingSpriteQuery = GetEntityQuery<FadingSpriteComponent>();
     }
 
     /// <summary>
@@ -34,7 +37,7 @@ public sealed class ClickableSystem : EntitySystem
     /// The draw depth for the sprite that captured the click.
     /// </param>
     /// <returns>True if the click worked, false otherwise.</returns>
-    public bool CheckClick(Entity<ClickableComponent?, SpriteComponent, TransformComponent?> entity, Vector2 worldPos, IEye eye, out int drawDepth, out uint renderOrder, out float bottom)
+    public bool CheckClick(Entity<ClickableComponent?, SpriteComponent, TransformComponent?, FadingSpriteComponent?> entity, Vector2 worldPos, IEye eye, bool excludeFaded, out int drawDepth, out uint renderOrder, out float bottom)
     {
         if (!_clickableQuery.Resolve(entity.Owner, ref entity.Comp1, false))
         {
@@ -52,6 +55,14 @@ public sealed class ClickableSystem : EntitySystem
             return false;
         }
 
+        if (excludeFaded && _fadingSpriteQuery.Resolve(entity.Owner, ref entity.Comp4, false))
+        {
+            drawDepth = default;
+            renderOrder = default;
+            bottom = default;
+            return false;
+        }
+
         var sprite = entity.Comp2;
         var transform = entity.Comp3;