Pager does not respect params from modify_query hook

It is possible to change the number of displayed rows via hook_apachesolr_modify_query:

function MODULENAME_apachesolr_modify_query(&$query, &$params, $caller) {
  $page = $params['rows'] ? $params['start'] / $params['rows'] : 0;
  $params['rows'] = 12;
  $params['start'] = $page * $params['rows'];
}

That works. If I have 1000 results, I would have 84 pages (ceil(1000 / 12)), but the pager still displays 100 pages (this is based on the default setting of 10 results per page). Clicking the last link in the pager leads to a page which says that there are not search results.

The patch attached changes apachesolr_search_execute to pass $params as a reference to apachesolr_do_query (which will indirectly invoke the modify query hooks).

The changed params are passed to apachesolr_process_response, where the pager is going to be initialized, now always with the correct number of rows.