InAir tweaks & chasm fixes (#19707)

Content.Shared/StepTrigger/Components/StepTriggerComponent.cs

@@ -42,10 +42,17 @@ public sealed partial class StepTriggerComponent : Component
     public float RequiredTriggerSpeed = 3.5f;
 
     /// <summary>
-    /// If any entities occupy the blacklist on the same tile then steptrigger won't work.
+    ///     If any entities occupy the blacklist on the same tile then steptrigger won't work.
     /// </summary>
     [DataField("blacklist")]
     public EntityWhitelist? Blacklist;
+
+    /// <summary>
+    ///     If this is true, steptrigger will still occur on entities that are in air / weightless. They do not
+    ///     by default.
+    /// </summary>
+    [DataField("ignoreWeightless")]
+    public bool IgnoreWeightless = false;
 }
 
 [RegisterComponent]

Content.Shared/StepTrigger/Systems/StepTriggerSystem.cs

@@ -1,3 +1,4 @@
+using Content.Shared.Gravity;
 using Content.Shared.StepTrigger.Components;
 using Robust.Shared.GameStates;
 using Robust.Shared.Map.Components;
@@ -10,6 +11,7 @@ namespace Content.Shared.StepTrigger.Systems;
 public sealed class StepTriggerSystem : EntitySystem
 {
     [Dependency] private readonly EntityLookupSystem _entityLookup = default!;
+    [Dependency] private readonly SharedGravitySystem _gravity = default!;
 
     public override void Initialize()
     {
@@ -121,6 +123,13 @@ public sealed class StepTriggerSystem : EntitySystem
         if (!component.Active || component.CurrentlySteppedOn.Contains(otherUid))
             return false;
 
+        // Can't trigger if we don't ignore weightless entities
+        // and the entity is flying or currently weightless
+        // Makes sense simulation wise to have this be part of steptrigger directly IMO
+        if (!component.IgnoreWeightless && TryComp<PhysicsComponent>(otherUid, out var physics) &&
+            (physics.BodyStatus == BodyStatus.InAir || _gravity.IsWeightless(otherUid, physics)))
+            return false;
+
         var msg = new StepTriggerAttemptEvent { Source = uid, Tripper = otherUid };
 
         RaiseLocalEvent(uid, ref msg, true);