Take parent library into account for animator checking

src/tracks/track_object.cpp

@@ -755,7 +755,7 @@ bool TrackObject::joinToMainTrack()
 {
     // If no physical object or there is animator, skip it
     // Also no joining if will affect kart (like moveable, flatten...)
-    if (!isEnabled() || !m_physical_object || m_animator ||
+    if (!isEnabled() || !m_physical_object || hasAnimatorRecursively() ||
         m_physical_object->isDynamic() || m_physical_object->isCrashReset() ||
         m_physical_object->isExplodeKartObject() ||
         m_physical_object->isFlattenKartObject())

src/tracks/track_object.hpp

@@ -231,6 +231,16 @@ public:
     // ------------------------------------------------------------------------
     const ThreeDAnimation* getAnimator() const { return m_animator; }
     // ------------------------------------------------------------------------
+    /* Return true if it has animator or its parent library has */
+    bool hasAnimatorRecursively() const
+    {
+        if (m_animator)
+            return true;
+        if (!m_parent_library)
+            return false;
+        return m_parent_library->hasAnimatorRecursively();
+    }
+    // ------------------------------------------------------------------------
     void setPaused(bool mode){ m_animator->setPaused(mode); }
     // ------------------------------------------------------------------------
     void setInitiallyVisible(bool val)           { m_initially_visible = val; }