feat(api/entity): add EntityEvent.Push when an entity is pushed

patches/minecraft/net/minecraft/world/entity/Entity.java.patch

@@ -244,6 +244,16 @@
     }
 
     public void moveRelative(float p_19921_, Vec3 p_19922_) {
+@@ -1450,7 +_,8 @@
+    }
+
+    public void push(double p_20286_, double p_20287_, double p_20288_) {
+-      this.setDeltaMovement(this.getDeltaMovement().add(p_20286_, p_20287_, p_20288_));
++      var motion = net.minecraftforge.common.ForgeHooks.onPush(this, p_20286_, p_20287_, p_20288_);
++      this.setDeltaMovement(this.getDeltaMovement().add(motion.x(), motion.y(), motion.z()));
+       this.hasImpulse = true;
+    }
+
 @@ -1630,6 +_,8 @@
              p_20241_.putBoolean("HasVisualFire", this.hasVisualFire);
           }

patches/minecraft/net/minecraft/world/entity/decoration/HangingEntity.java.patch

@@ -9,3 +9,14 @@
                 if (!blockstate.isSolid() && !DiodeBlock.isDiode(blockstate)) {
                    return false;
                 }
+@@ -170,6 +_,10 @@
+    }
+
+    public void push(double p_31744_, double p_31745_, double p_31746_) {
++      var motion = net.minecraftforge.common.ForgeHooks.onPush(this, p_31744_, p_31745_, p_31746_);
++      p_31744_ = motion.x();
++      p_31745_ = motion.y();
++      p_31746_ = motion.z();
+       if (!this.level().isClientSide && !this.isRemoved() && p_31744_ * p_31744_ + p_31745_ * p_31745_ + p_31746_ * p_31746_ > 0.0D) {
+          this.kill();
+          this.dropItem((Entity)null);

src/main/java/net/minecraftforge/common/ForgeHooks.java

@@ -129,6 +129,7 @@
 import net.minecraftforge.event.VanillaGameEvent;
 import net.minecraftforge.event.entity.EntityAttributeCreationEvent;
 import net.minecraftforge.event.entity.EntityAttributeModificationEvent;
+import net.minecraftforge.event.entity.EntityEvent;
 import net.minecraftforge.event.entity.item.ItemTossEvent;
 import net.minecraftforge.event.entity.living.EnderManAngerEvent;
 import net.minecraftforge.event.entity.living.LivingAttackEvent;
@@ -331,6 +332,13 @@ public static void onLivingJump(LivingEntity entity) {
         MinecraftForge.EVENT_BUS.post(new LivingJumpEvent(entity));
     }
 
+    public static Vec3 onPush(Entity entity, double motionX, double motionY, double motionZ)
+    {
+        var event = new EntityEvent.Push(entity, motionX, motionY, motionZ);
+        MinecraftForge.EVENT_BUS.post(event);
+        return event.getMotion();
+    }
+
     @SuppressWarnings("resource")
     @Nullable
     public static ItemEntity onPlayerTossEvent(@NotNull Player player, @NotNull ItemStack item, boolean includeName) {

src/main/java/net/minecraftforge/event/entity/EntityEvent.java

@@ -7,6 +7,7 @@
 
 import net.minecraft.core.SectionPos;
 import net.minecraft.world.entity.Entity;
+import net.minecraft.world.phys.Vec3;
 import net.minecraftforge.common.MinecraftForge;
 import net.minecraftforge.eventbus.api.Event;
 
@@ -108,4 +109,36 @@ public boolean didChunkChange() {
             return SectionPos.x(packedOldPos) != SectionPos.x(packedNewPos) || SectionPos.z(packedOldPos) != SectionPos.z(packedNewPos);
         }
     }
+
+    /**
+     * This event is fired whenever {@link Entity#push(double, double, double)} gets called.<br>
+     * You can use this to modify the push motion. <br>
+     * Setting the motion on all axies to 0 is equivalent to cancelling the push altogether
+     * <br>
+     * This event is not {@link net.minecraftforge.eventbus.api.Cancelable}.<br>
+     * <br>
+     * This event does not have a result. {@link HasResult}
+     * <br>
+     * This event is fired on the {@link MinecraftForge#EVENT_BUS}.<br>
+     **/
+    public static class Push extends EntityEvent
+    {
+        private Vec3 motion;
+
+        public Push(Entity entity, double motionX, double motionY, double motionZ)
+        {
+            super(entity);
+            this.motion = new Vec3(motionX, motionY, motionZ);
+        }
+
+        public Vec3 getMotion()
+        {
+            return this.motion;
+        }
+
+        public void setMotion(Vec3 motion)
+        {
+            this.motion = motion;
+        }
+    }
 }