Players are propelled forward when slipping (#7886)

* Slippery System checks if players are already down before slipping them again. Prevents chains of banana peels accelerating players to supersonic speeds.

* Slippery items and puddles now propel people, some more than others.

* a white space

Content.Shared/Slippery/SharedSlipperySystem.cs

@@ -91,6 +91,11 @@ namespace Content.Shared.Slippery
                 return false;
             }
 
+            if (EntityManager.HasComponent<KnockedDownComponent>(otherBody.Owner))
+            {
+                return false;
+            }
+
             var ev = new SlipAttemptEvent();
             RaiseLocalEvent(otherBody.Owner, ev, false);
             if (ev.Cancelled)

Resources/Prototypes/Entities/Effects/puddle.yml

@@ -15,6 +15,7 @@
   - type: Clickable
   - type: Evaporation
   - type: Slippery
+    launchForwardsMultiplier: 2.0
   - type: Physics
   - type: Fixtures
     fixtures:

Resources/Prototypes/Entities/Objects/Consumable/Food/produce.yml

@@ -178,6 +178,7 @@
     HeldPrefix: peel
   - type: Slippery
     intersectPercentage: 0.2
+    launchForwardsMultiplier: 6.0
   - type: CollisionWake
     enabled: false
   - type: Physics

Resources/Prototypes/Entities/Objects/Devices/pda.yml

@@ -132,6 +132,7 @@
     state: pda-clown
   - type: Slippery
     paralyzeTime: 4
+    launchForwardsMultiplier: 9.0
   - type: CollisionWake
     enabled: false
   - type: Physics
@@ -520,4 +521,3 @@
         state: pda-atmos
   - type: Icon
     state: pda-atmos
-        

Resources/Prototypes/Entities/Objects/Specific/Janitorial/soap.yml

@@ -15,6 +15,7 @@
   - type: Slippery
     paralyzeTime: 2
     intersectPercentage: 0.2
+    launchForwardsMultiplier: 6.0
   - type: CollisionWake
     enabled: false
   - type: Physics
@@ -67,6 +68,7 @@
     state: syndie
   - type: Slippery
     paralyzeTime: 5
+    launchForwardsMultiplier: 9.0
   - type: Item
     HeldPrefix: syndie
 
@@ -93,5 +95,6 @@
     state: omega
   - type: Slippery
     paralyzeTime: 7
+    launchForwardsMultiplier: 9.0
   - type: Item
     HeldPrefix: omega