Fix remote solution injection (#23429)

Checks if its own fixture is hard so the fly-by fixture can't also proc it.

Content.Server/Chemistry/Components/SolutionInjectOnCollideComponent.cs

@@ -1,18 +1,17 @@
 using Content.Shared.FixedPoint;
 using Content.Shared.Inventory;
 
-namespace Content.Server.Chemistry.Components
-{
-    /// <summary>
-    /// On colliding with an entity that has a bloodstream will dump its solution onto them.
-    /// </summary>
-    [RegisterComponent]
-    internal sealed partial class SolutionInjectOnCollideComponent : Component
-    {
+namespace Content.Server.Chemistry.Components;
 
+/// <summary>
+/// On colliding with an entity that has a bloodstream will dump its solution onto them.
+/// </summary>
+[RegisterComponent]
+public sealed partial class SolutionInjectOnCollideComponent : Component
+{
     [ViewVariables(VVAccess.ReadWrite)]
     [DataField("transferAmount")]
-        public FixedPoint2 TransferAmount { get; set; } = FixedPoint2.New(1);
+    public FixedPoint2 TransferAmount = FixedPoint2.New(1);
 
     [ViewVariables(VVAccess.ReadWrite)]
     public float TransferEfficiency { get => _transferEfficiency; set => _transferEfficiency = Math.Clamp(value, 0, 1); }
@@ -25,5 +24,4 @@ namespace Content.Server.Chemistry.Components
     /// </summary>
     [DataField("blockSlots"), ViewVariables(VVAccess.ReadWrite)]
     public SlotFlags BlockSlots = SlotFlags.MASK;
-    }
 }

Content.Server/Chemistry/EntitySystems/SolutionInjectOnCollideSystem.cs

@@ -6,11 +6,10 @@ using Content.Shared.Inventory;
 using JetBrains.Annotations;
 using Robust.Shared.Physics.Events;
 
-namespace Content.Server.Chemistry.EntitySystems
+namespace Content.Server.Chemistry.EntitySystems;
+
+public sealed class SolutionInjectOnCollideSystem : EntitySystem
 {
-    [UsedImplicitly]
-    internal sealed class SolutionInjectOnCollideSystem : EntitySystem
-    {
     [Dependency] private readonly SolutionContainerSystem _solutionContainersSystem = default!;
     [Dependency] private readonly BloodstreamSystem _bloodstreamSystem = default!;
     [Dependency] private readonly InventorySystem _inventorySystem = default!;
@@ -27,6 +26,7 @@ namespace Content.Server.Chemistry.EntitySystems
         var target = args.OtherEntity;
 
         if (!args.OtherBody.Hard ||
+            !args.OurBody.Hard ||
             !EntityManager.TryGetComponent<BloodstreamComponent>(target, out var bloodstream) ||
             !_solutionContainersSystem.TryGetInjectableSolution(ent.Owner, out var solution, out _))
         {
@@ -49,5 +49,4 @@ namespace Content.Server.Chemistry.EntitySystems
 
         _bloodstreamSystem.TryAddToChemicals(target, solToInject, bloodstream);
     }
-    }
 }