Process order of mounted objects and all children (+ fix)

t2dSceneObject::mount () {

    ...
    processLinkAfter( pSceneObject2D ); // After this line

    // Ensure all children are after parent.
    updateChildrenLinkOrder ();

    ...
}

//-----------------------------------------------------------------------------
// Ensure all children are after parent.
//-----------------------------------------------------------------------------
bool t2dSceneObject::updateChildrenLinkOrder( void )
{
   t2dSceneObject* pSceneObject2D = getSceneGraph()->getProcessHead()->getProcessNext();
   t2dSceneObject* nextSceneObject2D;
   bool changedOrder = false;
   bool childrenChanged = false;
   
   while (pSceneObject2D != this && pSceneObject2D != getSceneGraph()->getProcessHead()) {

      // get next before order is changed
      nextSceneObject2D = pSceneObject2D->getProcessNext();
      
      if (pSceneObject2D->mpMountedTo == this) {
         changedOrder = true;

         // Unlink from Process.
         pSceneObject2D->processUnLink();

         // Insert after parent.
         pSceneObject2D->processLinkAfter( this );

         // restore mpMountedTo which was initialized in processUnLink()
         pSceneObject2D->mpMountedTo = this;

         // make sure all of pSceneObject2D's children are fixed too
         childrenChanged = pSceneObject2D->updateChildrenLinkOrder ();

         if (childrenChanged) {
            // then the process order may have changed so we need to start over
            nextSceneObject2D = getSceneGraph()->getProcessHead()->getProcessNext();
         }
      }
      
      pSceneObject2D = nextSceneObject2D;
   }

   return changedOrder;
}