Improve minecart movement

By: md_5 <git@md-5.net>

paper-server/nms-patches/net/minecraft/world/entity/vehicle/EntityMinecartAbstract.patch

@@ -136,7 +136,7 @@
      }
  
      public void activateMinecart(int i, int j, int k, boolean flag) {}
-@@ -382,12 +447,16 @@
+@@ -382,16 +447,30 @@
  
          this.setDeltaMovement(MathHelper.clamp(vec3d.x, -d0, d0), vec3d.y, MathHelper.clamp(vec3d.z, -d0, d0));
          if (this.onGround()) {
@@ -155,7 +155,21 @@
          }
  
      }
-@@ -583,7 +652,7 @@
+ 
++    // CraftBukkit start
++    @Override
++    public Vec3D getKnownMovement() {
++        double d0 = this.getMaxSpeed();
++        Vec3D vec3d = super.getKnownMovement();
++
++        return new Vec3D(MathHelper.clamp(vec3d.x, -d0, d0), vec3d.y, MathHelper.clamp(vec3d.z, -d0, d0));
++    }
++    // CraftBukkit end
++
+     protected void moveAlongTrack(BlockPosition blockposition, IBlockData iblockdata) {
+         this.resetFallDistance();
+         double d0 = this.getX();
+@@ -583,7 +662,7 @@
      }
  
      protected void applyNaturalSlowdown() {
@@ -164,7 +178,7 @@
          Vec3D vec3d = this.getDeltaMovement();
  
          vec3d = vec3d.multiply(d0, 0.0D, d0);
-@@ -722,6 +791,14 @@
+@@ -722,6 +801,14 @@
          if (!this.level().isClientSide) {
              if (!entity.noPhysics && !this.noPhysics) {
                  if (!this.hasPassenger(entity)) {
@@ -179,7 +193,7 @@
                      double d0 = entity.getX() - this.getX();
                      double d1 = entity.getZ() - this.getZ();
                      double d2 = d0 * d0 + d1 * d1;
-@@ -896,4 +973,26 @@
+@@ -896,4 +983,26 @@
  
          private EnumMinecartType() {}
      }