PhysicsBody and Follow action bug in 3.4

[poowww]

In 3.4final, Follow Action doesn't work when follow Node added PhysicsBody.
In 3.3, it works.

Please fix this bug.

[WenhaiLin]

@poowww Can you provided a test case that can easily reproduce this?

[poowww]

@WenhaiLin Thanks for reply.

Please rewrite "Default project's HelloWorldScene.cpp" as follows.
It's a test case which this bug can reproduce.

Scene* HelloWorld::createScene()
{
    auto scene = Scene::createWithPhysics();
    auto world = scene->getPhysicsWorld();
    world->setDebugDrawMask(PhysicsWorld::DEBUGDRAW_ALL);
    auto layer = HelloWorld::create();
    scene->addChild(layer);

    return scene;
}

bool HelloWorld::init()
{
    if ( !Layer::init() )
    {
        return false;
    }

    auto groundBody = PhysicsBody::createBox(Size(2000, 100));
    groundBody->setDynamic(false);
    auto ground = Node::create();
    ground->setAnchorPoint(Vec2::ANCHOR_MIDDLE);
    ground->setPhysicsBody(groundBody);
    this->addChild(ground);
    ground->setPosition(Vec2(-1000,0));

    auto followedMaterial = PhysicsMaterial();
    followedMaterial.friction = 0;
    followedMaterial.density = 0;
    followedMaterial.restitution = 0;
    auto followedBody = PhysicsBody::createBox(Size(100,100),followedMaterial);
    followedBody->setDynamic(true);
    followedBody->setRotationEnable(false);
    auto followed = Node::create();
    followed->setAnchorPoint(Vec2::ANCHOR_MIDDLE);
    followed->setPhysicsBody(followedBody);
    this->addChild(followed);
    followed->setPosition(Vec2(-2000,300));

    auto followAction = Follow::create(followed);
    this->runAction(followAction);

    const auto acceleration = Vec2(5, 0);
    auto push = [followed, acceleration](float dt){followed->getPhysicsBody()->applyImpulse(acceleration);};
    this->schedule(push, 0.1f, "push");

    return true;
}