Deleting a gallery within a organic group will bring the user back to site front page?

solution:

Use batch_process() to redirect the page after batch_set(...):

function _node_gallery_delete(&$node) {

  if (in_array($node->type, (array)node_gallery_get_types('gallery'))) {
    $gid = $node->nid;
    $imagenids = node_gallery_get_image_nids($gid, FALSE, FALSE, TRUE);
    $total = count($imagenids);
    // Split our operations into X deletes at a time
    while (count($imagenids) > 0) {
      if (count($imagenids) >= NODE_GALLERY_BATCH_DELETE) {
        $nids = array_splice($imagenids, 0, 10);
      }
      else {
        $nids = $imagenids;
        unset($imagenids);
      }
      $operations[] = array('node_gallery_image_delete_process', array($nids));
    }
    if (!empty($operations)) {
      $batch = array(
        'operations' => $operations,
        'finished' => 'node_gallery_image_process_finished',
        'title' => t('Processing Gallery Delete.'),
        'init_message' => t('Gallery deletion is cascading to images.'),
        'progress_message' => t('Processing image deletions.'),
        'error_message' => t('Gallery deletion has encountered an error.'),
      );
      
      batch_set($batch);
      //------------------------add the following--------------------------------
			if( module_exists('og') ){
				$group = og_get_group_context();
				if( isset($group->nid) )
					batch_process('node/'.$group->nid);
			}
     //--------------------------------end-----------------------------------------
    }
    node_gallery_delete_gallery($node);
  }
  if (in_array($node->type, (array)node_gallery_get_types('image'))) {
    $gid = $node->gid;
    node_gallery_delete_image($node);
  }
  node_gallery_clear_gallery_caches($gid);
}

the only modification is between:

//-----------------------add following----------------------------

and

//---------------------------end-----------------------------------

And I will learn to make a patch first

Please find attached the patch,

It redirects the user to group node page, after deleting a gallery within that group.

@justintime, could you please take a look at the patch.

Thanks.