Fix walking in place animations when holding walk button (space-wizards#37887)

Fix SpriteMovement playing when holding walk button

Author: Tayrtahn

Content.Shared/Movement/Components/InputMoverComponent.cs

@@ -37,6 +37,14 @@ public sealed partial class InputMoverComponent : Component
 
         public MoveButtons HeldMoveButtons = MoveButtons.None;
 
+        /// <summary>
+        /// Does our input indicate actual movement, and not just modifiers?
+        /// </summary>
+        /// <remarks>
+        /// This can be useful to filter out input from just pressing the walk button with no directions, for example.
+        /// </remarks>
+        public bool HasDirectionalMovement => (HeldMoveButtons & MoveButtons.AnyDirection) != MoveButtons.None;
+
         // I don't know if we even need this networked? It's mostly so conveyors can calculate properly.
         /// <summary>
         /// Direction to move this tick.

Content.Shared/Movement/Systems/SharedMoverController.Input.cs

@@ -98,7 +98,7 @@ protected void SetMoveInput(Entity<InputMoverComponent> entity, MoveButtons butt
             RaiseLocalEvent(entity, ref moveEvent);
             Dirty(entity, entity.Comp);
 
-            var ev = new SpriteMoveEvent(entity.Comp.HeldMoveButtons != MoveButtons.None);
+            var ev = new SpriteMoveEvent(entity.Comp.HasDirectionalMovement);
             RaiseLocalEvent(entity, ref ev);
         }
 
@@ -124,7 +124,7 @@ private void OnMoverHandleState(Entity<InputMoverComponent> entity, ref Componen
                 entity.Comp.HeldMoveButtons = state.HeldMoveButtons;
                 RaiseLocalEvent(entity.Owner, ref moveEvent);
 
-                var ev = new SpriteMoveEvent(entity.Comp.HeldMoveButtons != MoveButtons.None);
+                var ev = new SpriteMoveEvent(entity.Comp.HasDirectionalMovement);
                 RaiseLocalEvent(entity, ref ev);
             }
         }