Fix #108215: Cycles: Point Cloud uses wrong position with Persistent Data

The problem here was that the sync code overwrites the point data, but didn't
reset the transform_applied flag, so the rest of the code assumed that the
points are already in world space and didn't apply the transform again.

intern/cycles/blender/pointcloud.cpp

@@ -207,6 +207,8 @@ void BlenderSync::sync_pointcloud(PointCloud *pointcloud, BObjectInfo &b_ob_info
                     need_motion,
                     motion_scale);
 
+  pointcloud->clear_non_sockets();
+
   /* Update original sockets. */
   for (const SocketType &socket : new_pointcloud.type->inputs) {
     /* Those sockets are updated in sync_object, so do not modify them. */

intern/cycles/scene/pointcloud.cpp

@@ -113,6 +113,11 @@ void PointCloud::reserve(const int numpoints)
   attributes.resize(true);
 }
 
+void PointCloud::clear_non_sockets()
+{
+  Geometry::clear(true);
+}
+
 void PointCloud::clear(const bool preserve_shaders)
 {
   Geometry::clear(preserve_shaders);

intern/cycles/scene/pointcloud.h

@@ -48,6 +48,7 @@ class PointCloud : public Geometry {
   ~PointCloud() override;
 
   /* Geometry */
+  void clear_non_sockets();
   void clear(const bool preserve_shaders = false) override;
 
   void resize(const int numpoints);